Yamaha Boating Equipment F25B User Manual
F25B  
T25B  
OWNER’S MANUAL  
U.S.A.Edition  
LIT-18626-05-06  
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EMU01449  
TO THE OWNER  
Thank you for choosing a Yamaha outboard  
motor. This Owner’s manual contains infor-  
mation needed for proper operation, mainte-  
nance and care. A thorough understanding  
of these simple instructions will help you  
obtain maximum enjoyment from your new  
Yamaha. If you have any question about the  
operation or maintenance of your outboard  
motor, please consult a Yamaha dealer.  
cC  
A CAUTION indicates special precautions  
that must be taken to avoid damage to  
the outboard motor.  
NOTE:  
A NOTE provides key information to make  
procedures easier or clearer.  
* Yamaha continually seeks advancements  
in product design and quality. Therefore,  
while this manual contains the most cur-  
rent product information available at the  
time of printing, there may be minor dis-  
crepancies between your machine and this  
manual. If there is any question concern-  
ing this manual, please consult your  
Yamaha dealer.  
In this Owner’s Manual particularly important  
information is distinguished in the following  
ways.  
The Safety Alert Symbol means  
ATTENTION! BECOME ALERT!  
YOUR SAFETY IS INVOLVED!  
Q
w
NOTE:  
Failure to follow WARNING instructions The F25MH, T25TR and their standard  
could result in severe injury or death to accessories are used as a base for the  
the machine operator, a bystander, or a explanations and illustrations in this manual.  
person inspecting or repairing the out- Therefore, some items may not apply to  
board motor.  
every model.  
EMU01446  
F25B, T25B  
OWNER’S MANUAL  
©2002 by Yamaha Motor Corporation, USA  
1st Edition, April 2002  
All rights reserved.  
Any reprinting or unauthorized use  
without the written permission of  
Yamaha Motor Corporation, USA  
is expressly prohibited.  
Printed in Japan  
P/N LIT-18626-05-06  
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EMU00003  
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CONTENTS  
GENERAL INFORMATION  
1
2
3
4
5
6
BASIC COMPONENTS  
OPERATION  
MAINTENANCE  
TROUBLE RECOVERY  
INDEX  
READ THIS OWNER’S MANUAL CAREFULLY  
BEFORE OPERATING YOUR OUTBOARD MOTOR.  
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EMU00004  
Chapter 1  
1
2
3
4
5
6
GENERAL  
INFORMATION  
IDENTIFICATION NUMBERS RECORD ..1-1  
Outboard motor serial number...........1-1  
Key number...........................................1-1  
EMISSION CONTROL INFORMATION...1-2  
SAFETY INFORMATION..........................1-4  
IMPORTANT LABELS ..............................1-6  
BASIC BOATING RULES .........................1-7  
FUELING INSTRUCTIONS.....................1-11  
Gasoline (Petrol).................................1-12  
ENGINE OIL ............................................1-13  
BATTERY REQUIREMENT ....................1-14  
PROPELLER SELECTION.......................1-15  
START-IN-GEAR PROTECTION ............1-16  
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EMU00005  
IDENTIFICATION NUMBERS  
RECORD  
EMU00007  
OUTBOARD MOTOR SERIAL  
NUMBER  
YAMAHA MOTOR CO., LTD.  
MADE IN JAPAN  
PAYS D'ORIGINE JAPON  
q
The outboard motor serial number is  
stamped on the label attached to the port  
side of the clamp-bracket.  
Record your outboard motor serial num-  
ber in the spaces provided to assist you in  
ordering spare parts from your Yamaha  
dealer or for reference in case your out-  
board motor is stolen.  
401013  
1 Outboard motor serial number  
EMU00008  
KEY NUMBER  
If a main key switch is equipped with the  
motor, the key identification number is  
stamped on your key as shown in the  
illustration. Record this number in the  
space provided for reference in case you  
need a new key.  
YAMAHA  
123  
q
1 Key number  
904011*  
1-1  
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EMU01385  
EMISSION CONTROL  
INFORMATION  
EMU01387  
NORTH AMERICAN MODELS  
q
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This engine conforms to U.S. Environ-  
mental Protection Agency (EPA) regula-  
tions for marine SI engines. See the label  
affixed to your engine for details.  
Approval label of Emission control  
certificate  
This label is attached to the bottom cowl-  
ing.  
1 Emission control information label  
EMISSION CONTROL INFORMATION  
EM  
ENGINE FAMILY :  
THIS ENGINE CONFORMS TO 201 U.S. EPA REGULATIONS FOR MARINE SI ENGINES.  
THIS ENGINE CONFORMS TO 201 CALIFORNIA EMISSION REGULATIONS FOR SI MARINE ENGINES.  
REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.  
g/kw-hr  
FELs :  
SPARK PLUG :  
IDLE SPEED :  
SPARK PLUG GAP (mm) :  
rpm IN NEUTRAL  
EX  
3
DISPLACEMENT :  
ADVERTISED POWER :  
cm  
kw  
FUEL : GASOLINE  
VALVE LASH (mm) :  
IN  
New Technology ; (4-stroke) EM  
Manufactured date label  
This label is attached to the clamp brack-  
et.  
2 Manufactured date label  
Manufactured:  
1-2  
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EMU01389  
STAR LABELS  
Your outboard motor is labeled with a  
California Air Resources Board (CARB)  
star label. See below for a description of  
your particular label.  
q
1 Star label  
000853  
One Star - Low Emission  
The one-star label identifies engines that  
meet the Air Resources Board’s 2001  
exhaust emission standards. Engines  
meeting these standards have 75% lower  
emissions than conventional carbureted  
two-stroke engines. These engines are  
equivalent to the U.S. EPA’s 2006 stan-  
dards for marine engines.  
Two Stars - Very Low Emission  
The two-star label identifies engines that  
meet the Air Resources Board’s 2004  
exhaust emission standards. Engines  
meeting these standards have 20% lower  
emissions than One Star-Low-Emission  
engines.  
Three Stars - Ultra Low Emission  
The three-star label identifies engines that  
meet the Air Resources Board’s 2008  
exhaust emission standards. Engines  
meeting these standards have 65% lower  
emissions than One Star-Low-Emission  
engines.  
1-3  
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EMU00917  
8 This product emits exhaust gases which  
contain carbon monoxide, a colorless,  
odorless gas which may cause brain  
damage or death when inhaled. Symp-  
toms include nausea, dizziness, and  
drowsiness. Keep cockpit and cabin  
areas well ventilated. Avoid blocking  
exhaust outlets.  
8 Check throttle, shift, and steering for  
proper operation before starting the  
engine.  
8 Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating. If you  
accidentally leave the helm, the lanyard  
will pull from the switch, stopping the  
engine.  
8 Know the marine laws and regulations  
where you will be boating - and obey  
them. Refer to the “RULES OF THE  
ROAD” section for basic boating rules.  
8 Stay informed about the weather.  
Check weather forecasts before boating.  
Avoid boating in hazardous weather.  
8 Tell someone where you are going:  
leave a Float Plan with a responsible  
person. Be sure to cancel the Float Plan  
when you return.  
8 Use common sense and good judgment  
when boating. Know your abilities, and  
be sure you understand how your boat  
handles under the different boating  
conditions you may encounter. Operate  
within your limits, and the limits of your  
boat. Always operate at safe speeds,  
and keep a careful watch for obstacles  
and other traffic.  
SAFETY  
Q INFORMATION  
8 Before mounting or operating the out-  
board motor, read this entire manual.  
Reading it should give you an under-  
standing of the motor and its operation.  
8 Before operating the boat, read any  
owner’s or operator’s manuals supplied  
with it and all labels. Be sure you under-  
stand each item before operating.  
8 Do not overpower the boat with this  
outboard motor. Overpowering the  
boat could result in loss of control. The  
rated power of the outboard should be  
equal to or less than the rated horse-  
power capacity of the boat. If the rated  
horsepower capacity of the boat is  
unknown, consult the dealer or boat  
manufacturer.  
8 Do not modify the outboard. Modifica-  
tions could make the motor unfit or  
unsafe to use.  
8 Never operate after drinking alcohol or  
taking drugs. About 50% of all boating  
fatalities involve intoxication.  
8 Have an approved personal flotation  
device (PFD) on board for every occu-  
pant. It is a good idea to wear a PFD  
whenever boating. At a minimum, chil-  
dren and non-swimmers should always  
wear PFDs, and everyone should wear  
PFDs when there are potentially haz-  
ardous boating conditions.  
8 Gasoline is highly flammable, and its  
vapors are flammable and explosive.  
Handle and store gasoline carefully.  
Make sure there are no gas fumes or  
leaking fuel before starting the engine.  
8 Always watch carefully for swimmers  
during the engine operation.  
8 Stay away from swimming areas.  
8 When a swimmer is in the water near  
you shift into neutral and shut off the  
engine.  
1-4  
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8 Be informed about boating safety. Addi-  
tional publications and information can  
be obtained from many organizations,  
including the following:  
United States Coast Guard  
Consumer Affairs Staff (G-BC)  
Office of Boating, Public, and Consumer  
Affairs  
U.S. Coast Guard Headquarters  
Washington, D.C. 20593-0001  
Boating Safety Hotline: 1-800-368-5647  
National Marine Manufacturers  
Association (NMMA)  
401 N. Michigan Ave.  
Chicago, Il 60611  
Marine Retailers Association of America  
155 N. Michigan Ave.  
Chicago, Il 60601  
1-5  
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EMU00014  
w
IMPORTANT LABELS  
q
WARNING LABELS  
1
WARNING  
This engine is equipped with a neutral starting device.  
The engine will not start unless the shift control is  
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in neutral position.  
202054*  
6E0-83627-41  
2
WARNING  
7Be sure shift control is in neutral  
before starting engine. (except 2HP)  
7Do not touch or remove electrical parts  
when starting or during operation.  
7Keep hands,hair,and clothes away from flywheel  
and other rotating parts while engine is running.  
6A1-83625-41  
CAUTION LABELS  
3
CAUTION  
Transport and store the engine only as shown.  
Otherwise, engine damage could result from  
leaking oil.  
6G8-13444-41  
1-6  
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EMU00015  
Stand-on vessel  
BASIC BOATING RULES  
The vessel with the right-of-way has the  
duty to continue its course and speed,  
except to avoid an immediate collision.  
When you maintain your direction and  
speed, the other vessel will be able to  
determine how best to avoid you.  
(Rules of the road)  
Just as there are rules which apply when  
you are driving on streets and high ways,  
there are waterway rules which apply  
when you are driving your boat. These  
rules are used internationally, and are  
also enforced by the United States Coast  
Guard and local agencies. You should be  
aware of these rules, and follow them  
whenever you encounter another vessel  
on the water.  
Give-way vessel  
The vessel which does not have the right-  
of-way has the duty to take positive and  
timely action to stay out of the way of the  
Stand-On vessel. Normally, you should  
not cross in front of the vessel with the  
right-of-way. You should slow down or  
change directions briefly and pass behind  
the other vessel. You should always move  
in such a way that the operator of the  
other vessel can see what you are doing.  
Several sets of rules prevail according to  
geographic location, but are all basically  
the same as the International Rules of the  
Road. The rules presented here in your  
Owner’s Manual are condensed, and have  
been provided for your convenience only.  
Consult your local U.S. Coast Guard Aux-  
iliary or Department of Motor Vehicles for  
a complete set of rules governing the  
waters in which you will be using your  
boat.  
“The general prudential rule”  
This rule is called Rule 2 in the Interna-  
tional Rules and says,  
‘In obeying and construing these rules  
due regard shall be had to all dangers of  
navigation and collision, and to any spe-  
cial circumstances, which may render a  
departure from the above rules necessary  
in order to avoid immediate danger.’  
STEERING AND SAILING RULES AND  
SOUND SIGNALS  
Whenever two vessels on the water meet  
one another, one vessel has the right-of-  
way; it is called the “stand-on” vessel.  
The vessel which does not have the right-  
of-way is called the “give-way” or “bur-  
dened” vessel. These rules determine  
which vessel has the right-of-way, and  
what each vessel should do.  
In other words, follow the standard rules  
except when a collision will occur unless  
both vessels try to avoid each other. If  
that is the case, both vessels become  
“Give-Way” vessels.  
1-7  
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will clear one another if you continue on  
your set course and speed.  
RULES WHEN ENCOUNTERING  
VESSELS  
There are three main situations which you  
may encounter with other vessels which  
could lead to a collision unless the Steer-  
ing Rules are followed:  
Meeting (you are approaching another  
vessel head-on)  
Crossing (you are traveling across the  
other vessel’s path)  
Overtaking (you are passing or being  
passed by another vessel)  
102044  
Crossing  
When two power driven vessels are  
crossing each other’s path close enough  
to run the risk of collision, the vessel  
which has the other on the starboard  
(right) side must keep out of the way of  
the other. If the other vessel is on your  
right, you must keep out of its way; you  
are the Give-Way vessel. If the other ves-  
sel is on your port (left) side, remember  
that you should maintain course and  
direction, provided the other vessel gives  
you the right-of-way as it should.  
In the following illustration, your boat is  
in the center. You should give the right-of-  
way to any vessels shown in white area  
(you are the Give-Way vessel). Any ves-  
sels in the shaded area must yield to you  
(they are the Give-Way vessels). Both you  
and the meeting vessel must alter course  
to avoid each other.  
102045  
Meeting  
If you are meeting another power vessel  
head on, and are close enough to run the  
risk of collision, neither of you has the  
right-of-way! Both of you should alter  
course to avoid an accident. You should  
keep the other vessel on your port (left)  
side. This rule doesn’t apply if both of you  
102046  
Overtaking  
If you are passing another vessel, you are  
the “Give-Way” vessel. This means that  
the other vessel is expected to maintain  
1-8  
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its course and speed. You must stay out Sailing vessel right-of-way  
of its way until you are clear of it. Like- Sailing vessels should normally be given  
wise, if another vessel is passing you, you the right-of-way. The exceptions to this  
should maintain your speed and direction are:  
so that the other vessel can steer itself 1. When the sailing vessel is overtaking  
around you.  
the power-driven vessel, the power-  
driven vessel has the right-of-way.  
2. Sailing vessels should keep clear of  
any fishing vessel.  
3. In a narrow channel, a sailing vessel  
should not hamper the safe passage  
of a power-driven vessel which can  
navigate only in such a channel.  
OTHER SPECIAL SITUATIONS  
There are three other rules you should be  
aware of when driving your boat around  
other vessels.  
Narrow channels and bends  
When navigating in narrow channels, you  
should keep to the right when it is safe  
and practical to do so. If the operator of a  
power-driven vessel is preparing to go  
around a bend that may obstruct the view  
of other water vessels, the operator  
should sound a prolonged blast on the  
whistle (4 to 6 seconds). If another vessel  
is around the bend, it too should sound  
the whistle. Even if no reply is heard,  
however, the vessel should still proceed  
around the bend with caution. If you navi-  
gate such waters with your boat, you will  
need to carry a portable air horn, avail-  
able from local marine supply stores.  
Reading buoys and other markers  
The waters of the United states are  
marked for safe navigation by the lateral  
system of buoyage. Simply put, buoys  
and markers have an arrangement of  
shapes, colors, numbers and lights to  
show which side of the buoy a boater  
should pass on when navigating in a par-  
ticular direction. The markings on these  
buoys are oriented from the perspective  
of being entered from seaward (the  
boater is going towards the port). This  
means that red buoys are passed on the  
starboard (right) side when proceeding  
from open water into port, and black  
buoys are to port (left) side. When navi-  
gating out of port, your position with  
respect to the buoys should be reversed;  
red buoys should be to port and black  
buoys to starboard.  
Fishing vessel right-of-way  
All vessels which are fishing with nets,  
lines or trawls are considered to be “fish-  
ing vessels” under the International  
Rules. Vessels with trolling lines are not  
considered fishing vessels. Fishing ves-  
sels have the right-of-way regardless of  
position. Fishing vessels cannot, howev-  
er, impede the passage of other vessels in  
narrow channels.  
Many bodies of water used by boaters are  
entirely within the boundaries of a partic-  
ular state. The Uniform State Waterway  
Marking System has been devised for  
these waters. This system uses buoys and  
signs with distinctive shapes and colors  
to show regulatory or advisory informa-  
1-9  
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tion. These markers are white with black  
letters and orange boarders. They signify  
speed zones, restricted areas, danger  
areas, and general information.  
Remember, markings may vary by geo-  
graphic location. Always consult local  
boating authorities before driving your  
boat in unfamiliar waters.  
MAIN CHANNEL BUOYS  
"1" " 3" " 5" " 7"  
" 6"  
LIGHTED BUOY (Port Hand)`  
C "1"  
N " 2"  
" 7"  
Odd number. increasing toward head of naviga-  
tion.Leave to port (left) proceeding upstream.  
RB " L"  
or  
White Light  
Green Light  
RG " L"  
1
1
OR  
"5"  
new  
BUOY  
old  
COLOR CODE  
"4"  
BLACK  
" 2" " 4" " 6"  
RED  
LIGHTED BUOY (Starboard Hand)`  
Even number,increasing toward head of naviga-  
tion. Leave to starboard (right) proceeding up-  
stream.  
" 3"  
GREEN  
White Light  
Red Light  
"A"  
2
2
OR  
" 2"  
new  
old  
"1"  
"A"  
LIGHTED SAFE WATER BUOY  
Proceeding toward head  
of navigation from seaward  
No number. Marks midchannel, pass on either  
side. Letter has no lateral significance, used for  
identification and location purposes.  
SECONDARY CHANNEL BUOYS  
Top Mark  
STARTS NEW NUMBERING SYSTEM  
White Light  
White Light  
C
" 1"  
CAN BUOY  
A
A
Odd number. Leave to port.  
OR  
1
1
OR  
new  
old  
old  
new  
RB " L"  
RG " L"  
LIGHTED PREFERRED CHANNEL TO  
PORT BUOY  
N
" 2"  
NUN BUOY  
Even number. Leave to starboard  
No number. Topmost band red  
-
preferred  
channel is to left of buoy. Letter has no lateral  
significance, used for identification and location  
purposes.  
Red or  
White Light  
Red Light  
2
L
L
new  
old  
No change  
102052  
1-10  
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EMU00016  
FUELING INSTRUCTIONS  
w
GASOLINE AND ITS VAPORS ARE HIGH-  
LY FLAMMABLE AND EXPLOSIVE!  
8 Do not smoke when refueling, and  
keep away from sparks, flames, or  
other sources of ignition.  
8 Stop engine before refueling.  
8 Refuel in a well-ventilated area. Refuel  
portable fuel tanks off the boat.  
8 Take care not to spill gasoline. If gaso-  
line spills, wipe it up immediately with  
dry rags.  
8 Do not overfill the fuel tank.  
8 Tighten the filler cap securely after  
refueling.  
8 If you should swallow some gasoline  
inhale a lot of gasoline vapor, or get  
gasoline in your eyes, get immediate  
medical attention.  
8 If any gasoline spills onto your skin,  
immediately wash with soap and  
water. Change clothing if gasoline spills  
on it.  
8 Touch the fuel nozzle to the filler open-  
ing or funnel to help prevent electrosta-  
tic sparks.  
cC  
Use only new clean gasoline which has  
been stored in clean containers and is not  
contaminated with water or foreign mat-  
ter.  
1-11  
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EMU01804  
GASOLINE  
Recommended gasoline:  
Regular unleaded gasoline with a  
minimum octane rating of 86  
(Pump Octane Number) = (R+M)/2  
If knocking or pinging occurs, use a differ-  
ent brand of gasoline or premium unlead-  
ed fuel.  
EMU00027  
Gasohol  
There are two types of gasohol: gasohol  
containing ethanol and that containing  
methanol. Gasohol containing ethanol  
can be used if ethanol content does not  
exceed 10% and the fuel meets minimum  
octane ratings. Gasohol containing  
methanol is not recommended by Yama-  
ha because it can cause fuel system dam-  
age or engine performance problems.  
1-12  
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EMU01769  
ENGINE OIL  
Recommended engine oil:  
4-stroke motor oil with a combination of  
corresponding SAE and API as shown in  
the chart.  
SAE  
API  
SE  
SF  
SG  
SH  
SJ  
10W-30  
10W-40  
Engine oil quantity:  
See Chapter 4, “Specifications.”  
cC  
All 4-stroke engines are shipped from the  
factory without engine oil.  
001162  
1-13  
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EMU01775  
BATTERY REQUIREMENT  
cC  
Do not use a battery that does not meet  
the specified capacity. If a battery which  
does not meet specifications is used, the  
electric system could perform poorly or  
be overloaded, causing electric system  
damage.  
For electric start models, choose a battery  
which meets the following specifications.  
EMU01859  
Minimum cold cranking amps  
(CCA/SAE):  
245 amps at -18°C (-0.4°F)  
Minimum marine cranking amps  
(MCA/ABYC):  
323 amps at 0°C (32°F)  
Minimum reserve capacity (RC/SAE):  
52 minutes  
EMU01783¯  
cC  
A battery cannot be connected to models  
that do not have a rectifier or Rectifier  
Regulator.  
Models without a rectifier or Rectifier  
Regulator: F25MH  
8 If you wish to use a battery with the  
above models, install an optional Recti-  
fier Regulator.  
1-14  
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EMU01395  
PROPELLER SELECTION  
The performance of your outboard motor  
will be critically affected by your choice of  
propeller, as an incorrect choice could  
adversely affect performance and could  
also seriously damage the motor. Engine  
speed depends on the propeller size and  
boat load. If engine speed is too high or  
too low for good engine performance,  
this will have an adverse effect on the  
engine.  
Yamaha outboard motors are fitted with  
propellers chosen to perform well over a  
range of applications, but there may be  
uses where a propeller with a different  
pitch would be more appropriate. For a  
greater operating load, a smaller-pitch  
propeller is more suitable as it enables  
the correct engine speed to be main-  
tained. Conversely, a larger-pitch pro-  
peller is more suitable for a smaller oper-  
ating load.  
12-1/4 x 9 - G  
q
we  
Yamaha dealers stock a range of pro-  
pellers, and can advise you and install a  
propeller on your outboard that is best  
suited to your application.  
NOTE:  
000601  
At full throttle and under a maximum  
boat load, the engine’s rpm should be  
within the upper half of the full throttle  
operating range, as listed in “SPECIFICA-  
TIONS” on page 4-1. Select a propeller  
which fulfills this requirement.  
10-3/4x17-F  
1
23  
If operating under conditions which allow  
the engine’s rpm to rise above the maxi-  
mum recommended range (such as light  
boat loads), reduce the throttle setting to  
maintain the rpm in the proper operating  
range.  
602016  
1-15  
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1 Propeller diameter (in inches)  
2 Propeller pitch (in inches)  
3 Type of propeller (propeller mark)  
Refer to the section “CHECKING PRO-  
PELLER” for instructions on propeller  
removal and installation.  
EMU01209  
START-IN-GEAR PROTECTION  
Yamaha outboard motors or Yamaha  
approved remote control units are  
equipped with start-in-gear protection  
device(s). This feature permits the engine  
to be started only when it is Neutral.  
Always select Neutral before starting the  
engine.  
1-16  
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-MEMO-  
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EMU00037  
Chapter 2  
1
2
3
4
5
6
BASIC COMPONENTS  
MAIN COMPONENTS..............................2-1  
OPERATIONS OF CONTROLS AND  
OTHER FUNCTIONS ................................2-2  
Fuel tank.................................................2-2  
Gear shift lever......................................2-3  
Recoil starter handle.............................2-3  
Starter button ........................................2-3  
Tiller handle...........................................2-3  
Remote control......................................2-6  
Steering friction adjusting lever........2-10  
Trim tab................................................2-11  
Trim angle adjusting rod....................2-13  
Power trim/tilt switch..........................2-13  
Warning indicator(s)...........................2-14  
Digital tachomoter ..............................2-14  
Tilt lock mechanism............................2-17  
Tilt support knob.................................2-17  
Tilt support bar....................................2-17  
Top cowling lock lever .......................2-17  
Flushing device ...................................2-18  
WARNING SYSTEM ..............................2-19  
Overheat warning ...............................2-19  
Low oil pressure warning ..................2-20  
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EMU01206  
MAIN COMPONENTS  
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1 Top cowling  
2 Top cowling lock lever  
3 Oil drain bolt  
4 Anti-cavitation plate  
5 Trim tab  
6 Propeller  
*r Gear shift lever  
*t Tiller handle  
*y Steering friction adjusting lever  
*u Clamp screw  
*i Rope attachment  
*o Tilt lock lever  
7 Cooling water inlet  
8 Trim angle adjusting rod  
9 Clamp bracket  
*0 Power trim and tilt switch  
*q Starter button  
p Flushing device  
*a Tilt support knob  
*s Remote control box  
*d Digital tachometer  
*f Fuel tank  
*w Recoil starter handle  
*e Warning indicator  
*
May not be exactly as shown; also may not  
be included as standard equipment on all  
models.  
2-1  
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EMU00039  
OPERATIONS OF CONTROLS  
AND  
OTHER FUNCTIONS  
EMU00040  
FUEL TANK  
If your model was equipped with a  
portable fuel tank, its function is as fol-  
lows.  
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1 Fuel hose joint  
2 Fuel meter (If equipped)  
3 Fuel tank cap  
4 Air vent screw (If equipped)  
EMU00042  
Fuel Hose Joint  
This connector is provided for connecting  
or disconnecting fuel hose.  
EMU00044  
902051  
Fuel Meter  
This meter is on the fuel tank cap. It  
shows current fuel quantity in the fuel  
tank approximately.  
EMU00045  
Fuel Tank Cap  
This cap is for filling fuel. To remove it,  
turn it counterclockwise.  
EMU00046  
Air Vent Screw  
This screw is on the fuel tank cap. To  
loosen it, turn it counterclockwise.  
2-2  
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EMU00051  
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GEAR SHIFT LEVER  
(for Tiller control model)  
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Turning the gear-shift lever towards you  
engages the clutch with the forward gear  
so that the boat moves ahead. Turning  
the lever away from you engages the  
reverse gear so that the boat moves  
astern.  
1 Neutral  
2 Forward  
3 Reverse  
EMU00059  
RECOIL STARTER HANDLE  
(If equipped)  
Pull the handle gently until resistance is  
felt. Then vigorously pull the handle  
straight out to crank the engine to start it.  
EMU00060  
STARTER BUTTON  
(for Tiller control model)  
When you push the starter button, the  
electric starter motor cranks the engine to  
start it.  
101043**  
EMU00064  
TILLER HANDLE  
(for Tiller control model)  
Moving the tiller handle sideways to  
adjust the steering direction. In addition,  
this handle contains the functions as fol-  
lows.  
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1 Throttle control grip  
2 Throttle indicator  
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3 Throttle friction adjusting knob/screw  
4 Engine stop button / Engine stop lanyard  
switch  
2-3  
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EMU00065  
Throttle Control Grip  
The throttle control grip is on the tiller  
handle. Turn the grip counterclockwise to  
increase speed and clockwise to decrease  
speed.  
EMU00067  
Throttle Indicator  
q
The fuel consumption curve on the throt-  
tle indicator shows the relative amount of  
fuel consumed for each throttle position.  
Choose the setting that offers the best  
performance and fuel economy for the  
desired operation.  
START  
1 Throttle indicator  
EMU01294  
Throttle Friction Adjusting Knob  
A friction device in the tiller handle pro-  
vides resistance to movement of the  
throttle grip. This is adjustable for opera-  
tor preference.  
Resistance  
Increase  
Knob  
Turn clockwise  
Turn counterclockwise  
502016  
Decrease  
When constant speed is desired, tighten  
the adjusting knob to maintain the  
desired throttle setting.  
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Do not overtighten the friction adjusting  
knob. If there is too much resistance, it  
may be difficult to move the throttle grip,  
which could result in an accident.  
2-4  
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EMU00932  
Engine Stop Lanyard Switch  
The lock-plate 1 must be attached to the  
engine stop lanyard switch for the engine  
to run. The lanyard 2 should be attached  
to a secure place on the operator’s cloth-  
ing, or arm or leg. Should the operator fall  
overboard or leave the helm, the lanyard  
will pull out the lock plate, stopping igni-  
tion to the engine. This will prevent the  
boat from running away under power.  
w
8 Attach the lanyard to a secure place on  
your clothing, your arm or leg while  
operating.  
8 Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard in such a way that it could  
become entangled, preventing it from  
functioning.  
q
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000647  
8 Avoid accidentally pulling the lanyard  
during normal operation. Loss of  
engine power means the loss of most  
steering control. Also, without engine  
power, the boat could slow rapidly.  
This could cause people and objects in  
the boat to be thrown forward.  
NOTE:  
The engine cannot be started with the  
lock-plate removed.  
EMU00072  
Engine Stop Button  
Pushing this button opens the ignition cir-  
cuit and stops the engine.  
506021  
2-5  
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EMU00096*  
REMOTE CONTROL  
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Both the shifter and the throttle are actu-  
ated by the remote control lever.  
Additionally, the remote control also has  
the electrical switches.  
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1 Remote control lever  
2 Neutral interlock trigger  
3 Neutral throttle lever  
000200  
4 Main switch  
5 Engine stop lanyard switch  
6 Power trim and tilt switch (if equipped)  
7 Throttle friction adjusting screw  
EMU00098*  
Remote Control Lever  
Moving the lever forward from the  
Neutral position engages Forward gear.  
Pulling the lever back from Neutral  
engages Reverse. The engine will contin-  
ue to run at idle until the lever is moved  
about 35° (a detent can be felt). Moving  
the lever further opens the throttle, and  
the engine will begin to accelerate.  
Nq  
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F
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1 Neutral  
2 Forward  
3 Reverse  
4 Shift  
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5 Fully closed  
6 Throttle  
7 Fully open  
701031  
EMU00099  
Neutral Interlock Trigger  
To shift out of Neutral, the neutral inter-  
lock trigger of the remote control lever  
must first be pulled up.  
701036  
2-6  
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EMU00100  
Neutral Throttle Lever  
N
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To open the throttle without shifting into  
either Forward or Reverse, place the  
remote control lever in the Neutral posi-  
tion and lift the neutral throttle lever.  
NOTE:  
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The neutral throttle lever will operate only  
when the remote control lever is in  
Neutral. The remote control lever will  
operate only when the neutral throttle  
lever is in the closed position.  
701033*  
1 Fully open  
2 Fully closed  
EMU00101  
Main switch  
ON  
OFF  
START  
The main switch controls the ignition sys-  
tem; its operation is described below.  
8 OFF  
Electrical circuits switched off.  
(The key can be removed.)  
8 ON  
Electrical circuits switched on.  
(The key cannot be removed.)  
8 START  
701021  
Starter-motor will turn and start engine.  
(When the key is released, it returns auto-  
matically to “ON”.)  
2-7  
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EMU00934  
Engine Stop Lanyard Switch  
The lock-plate 1 must be attached to the  
engine stop lanyard switch for the engine  
to run. The lanyard 2 should be attached  
to a secure place on the operator’s cloth-  
ing, or arm or leg. Should the operator fall  
overboard or leave the helm, the lanyard  
will pull out the lock plate, stopping igni-  
tion to the engine. This will prevent the  
boat from running away under power.  
q
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000569  
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8 Attach the lanyard to a secure place on  
your clothing, your arm or leg while  
operating.  
8 Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard in such a way that it could  
become entangled, preventing it from  
functioning.  
8 Avoid accidentally pulling the lanyard  
during normal operation. Loss of  
engine power means the loss of most  
steering control. Also, without engine  
power, the boat could slow rapidly.  
This could cause people and objects in  
the boat to be thrown forward.  
NOTE:  
The engine cannot be started with the  
lock-plate removed.  
2-8  
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EMU01331  
Power Trim/Tilt Switch  
The power trim/tilt adjusts the motor  
angle in relation to the transom. The  
power trim/tilt switch is located on the  
remote control lever grip. Pushing the  
switch “UP” trims the motor up, then tilts  
the motor up. Pressing the switch “DN”  
tilts the motor down and trims the motor  
down. When the switch button is  
released, the motor will stop in its current  
position.  
UP  
DN  
UP  
DN  
701034*  
NOTE:  
Refer to the sections “ADJUSTING TRIM  
ANGLE” and “TILTING UP/DOWN” in  
Chapter 3 for instructions on usage.  
EMU01155  
Throttle Friction Adjusting Screw  
A friction device in the remote control box  
provides adjustable resistance to move-  
ment of the remote control lever, and can  
be set according to operator preference.  
An adjusting screw is located on the front  
of the remote control box.  
Resistance  
Increase  
Screw  
Turn clockwise  
Turn counterclockwise  
Decrease  
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Do not overtighten the friction adjusting  
screw. If there is too much resistance, it  
may be difficult to move the lever, which  
could result in an accident.  
701035  
2-9  
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EMU00110*  
STEERING FRICTION ADJUSTING  
LEVER  
A friction device provides resesistance  
steering movement. This is adjustable for  
operator preference.  
Resistance  
Increase  
Lever  
Turn clockwise  
Turn counterclockwise  
408026  
Decrease  
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Do not overtighten the friction adjusting  
lever. If there is too much resistance, it  
may be difficult to steer, which could  
result in an accident.  
2-10  
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EMU00114  
TRIM TAB  
The trim tab should be adjusted so that  
the steering control can be turned to  
either the right or left by applying the  
same amount of force.  
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An improperly adjusted trim tab may  
cause difficult steering. Always test run  
after the trim tab has been installed or  
replaced to be sure steering is correct. Be  
sure you have tightened the bolt after  
adjusting the trim tab.  
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A
1 Trim tab  
2 Bolt  
B
Boat tends to veer The fin of trim tab  
To the left  
(port side)  
“Turn to the left(port  
side), “A” in the figure”  
603013*  
To the right  
(starboard side)  
“Turn to the right(star-  
board side), “B” in the  
figure”  
2-11  
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EMU00113*  
TRIM TAB  
FT25  
The trim tab should be adjusted so that  
the steering control can be turned to  
either the right or left by applying the  
same amount of force.  
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An improperly adjusted trim tab may  
cause difficult steering. Always test run  
after the trim tab has been installed or  
replaced to be sure steering is correct. Be  
sure you have tightened the bolt after  
adjusting the trim tab.  
FT25  
A
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1 Trim tab  
2 Bolt  
B
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Boat tends to veer The fin of trim tab  
603021  
To the left  
(port side)  
Turn to the left  
(A in the figure)  
To the right  
(starboard side)  
Turn to the right  
(B in the figure)  
cC  
The trim tab also serves as an anode to  
protect the engine from electrochemical  
corrosion. Never paint the trim tab as it  
will become ineffective as an anode.  
2-12  
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EMU01297  
TRIM ANGLE ADJUSTING ROD  
The position of the trim angle adjusting  
rod determines the minimum trim angle  
of the outboard motor in relation to the  
transom.  
404012  
EMU01125  
POWER TRIM/TILT SWITCH  
The power trim/tilt adjusts the motor  
angle in relation to the transom. The  
power trim/tilt switch is located on the  
side of the bottom engine cowling.  
Pushing the switch “UP” trims the motor  
up, then tilts the motor up. Pressing the  
switch “DN” tilts the motor down and  
trims the motor down. When the switch  
button is released, the motor will stop in  
its current position.  
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Use the power trim/tilt switch located on  
the bottom engine cowling only when  
the boat is at a complete stop with the  
engine off. Attempting to use the cowl-  
ing-mounted power trim/tilt switch while  
the boat is moving could increase the risk  
of falling overboard and could distract  
the operator, increasing the risk of colli-  
sion with another boat or an obstacle.  
UP  
DN  
302014*  
NOTE:  
Refer to the section “Adjusting Trim  
Angle” and “Tilting Up/Down” for instruc-  
tions on usage.  
2-13  
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EMU01128  
WARNING INDICATOR(S)  
If the engine develops a condition moni-  
tored by the warning system, an indicator  
will come on.  
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Refer to the “WARNING SYSTEM” sec-  
tion for details.  
1 Warning indicator(s)  
223012  
EMU01617  
DIGITAL TACHOMETER  
This gauge contains the tachometer, trim  
meter, hour meter, low oil pressure warn-  
ing indicator, and the overheat warning  
indicator.  
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1 Tachometer  
2 Trim meter  
3 Hour meter  
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001081  
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4 Low oil pressure warning indicator  
5 Overheat warning indicator  
6 Set button  
7 Mode button  
NOTE:  
All segments of the display will light  
momentarily after the main switch is  
turned on and will return to normal there-  
after.  
001085  
EMU00136  
Tachometer  
This meter shows the engine speed.  
001058  
2-14  
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EMU01109  
Trim Meter  
This meter shows the trim angle of your  
outboard motor.  
NOTE:  
8 Memorize the trim angles that work  
best for your boat under different condi-  
tions. Adjust the trim angle to the  
desired setting by operating the power  
trim and tilt switch.  
001059  
8 If the trim angle of your motor exceeds  
the trim operating range, the top seg-  
ment on the trim meter display will start  
to blink.  
EMU01620  
Hour Meter  
This meter shows the number of hours  
the engine has been run. It can be set to  
show the total number of hours or the  
number of hours for the current trip. The  
display can also be turned on and off.  
8 Changing the display format  
Pressing the MODE button changes the  
display format in the following circular  
pattern:  
001088  
Total hours - Trip hours - Display off  
8 Resetting the trip hours  
Simultaneously pressing the SET and  
MODE buttons for more than 1 second  
while the trip hours are displayed resets  
the trip counter to 0 (zero).  
NOTE:  
The total number of hours the engine has  
been run cannot be reset.  
2-15  
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EMU01110  
Low Oil Pressure Warning Indicator  
If oil pressure drops too low, the warning  
indicator will start to blink. Refer to the  
section “LOW OIL PRESSURE WARNING”  
for details.  
1 Low oil pressure warning indicator  
001060  
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cC  
8 Do not operate the engine without oil.  
Serious engine damage will occur.  
8 The low oil pressure warning indicator  
does not indicate the oil level in the  
engine. Use the Oil Level Gauge to  
check the remaining oil quantity. (Refer  
to the section “CHECKING THE ENGINE  
OIL LEVEL” for details.)  
EMU01553  
Overheat Warning Indicator  
If the engine temperature rises too high,  
the warning indicator will start to blink.  
Refer to “OVERHEAT WARNING” for  
details.  
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1 Overheat warning indicator  
001061  
cC  
Do not continue to operate the engine if a  
warning device has activated. If neces-  
sary, refer to the “TROUBLESHOOTING”  
section in this manual. Consult your deal-  
er if the problem cannot be located and  
corrected.  
2-16  
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EMU00153  
TILT LOCK MECHANISM  
(for Manual tilt model)  
The tilt-lock mechanism is used to pre-  
vent reverse thrust from the propeller lift-  
ing the outboard motor when reversing.  
To lock it, set the tilt-lock lever in the Lock  
position.  
q
To release it, place the tilt-lock lever in the  
Tilt position.  
402073  
1 Tilt-lock lever  
EMU00155  
TILT SUPPORT KNOB  
To keep the outboard motor in the tilted-  
up position, push the tilt support knob  
under the swivel bracket.  
403054  
EMU00156  
TILT SUPPORT BAR  
The tilt support bar 1 keeps the outboard  
motor in the tilted up position.  
q
403052  
EMU00162  
TOP COWLING LOCK LEVER  
To remove the engine top cowling, turn  
the lock lever. Then lift off the cowling.  
When replacing the cowling, check to be  
sure it fits properly in the rubber seal.  
Then lock the cowling again by moving  
the lever upward.  
q
301044  
1 Top cowling lock lever  
2-17  
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EMU01146  
FLUSHING DEVICE  
This device 1 is used to clean the cooling  
water passages of the motor using a gar-  
den hose and tap water.  
q
NOTE:  
Refer to “Cleaning Cooling-water  
Passages” in Chapter 4 for instructions on  
usage.  
101043*  
2-18  
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EMU00169  
WARNING SYSTEM  
cC  
Do not continue to operate the engine if  
the warning device has activated. Consult  
your Yamaha dealer if the problem can-  
not be located and corrected.  
001053  
EMU01476  
OVERHEAT WARNING  
This engine has an overheat warning  
device. If the engine temperature rises too  
high, the warning device will activate.  
(1) ; Included (–); N/A  
Activation of  
warning device  
Tiller  
control  
model  
Remote  
control  
model  
701054  
The engine speed  
will automatically  
decrease to about  
2,000 r/min.  
1
1
The overheat warning  
indicator will come on.  
*
—
—
1
The buzzer will sound.  
1
If the warning system has been activated,  
stop the engine and check the water inlet  
for clogging.  
605021  
* Not equipped on all models.  
2-19  
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EMU00173  
F25MH/F25EH  
LOW OIL PRESSURE WARNING  
If oil pressure drops too low, the warning  
device will activate.  
(1):Included (–):N/A  
Activation of warning  
device  
Tiller  
control  
model  
Remote  
control  
model  
223012**  
Engine speed will  
automatically decrease  
to about 2,000 r/min.  
1
1
The low oil pressure  
warning indicator will  
come on.  
1
1
1
The buzzer will sound.  
—
If the warning system has been activated,  
stop the engine as soon as it is safe to do  
so. Check oil level and add oil as needed.  
If the oil level is correct, consult your  
Yamaha dealer.  
001063  
cC  
Do not continue to run the engine if the  
low oil pressure lamp is “ON”. Serious  
engine damage may occur.  
701054  
2-20  
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-MEMO-  
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EMU00174  
Chapter 3  
1
2
3
4
5
6
OPERATION  
INSTALLATION ........................................3-1  
Mounting the outboard motor ............3-2  
Clamping the outboard motor.............3-4  
BREAKING IN (RUNNING IN) ENGINE ..3-5  
PRE-OPERATION CHECKS......................3-6  
Checking the engine oil level...............3-7  
FILLING FUEL ...........................................3-8  
STARTING ENGINE .................................3-9  
WARMING UP ENGINE.........................3-14  
SHIFTING ................................................3-15  
Forward................................................3-15  
Reverse ................................................3-16  
STOPPING ENGINE ...............................3-17  
TRIMMING OUTBOARD MOTOR.........3-18  
Adjuting trim angle.............................3-19  
TILTING UP/DOWN ...............................3-22  
CRUISING IN SHALLOW WATER.........3-25  
CRUISING IN OTHER CONDITIONS.....3-27  
Cruising in salt water..........................3-27  
Cruising in turbid water .....................3-27  
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EMU00175  
INSTALLATION  
cC  
Incorrect engine height or obstructions to  
smooth water flow (such as the design or  
condition of the boat or accessories such  
as transom ladders/depth finder trans-  
ducers) can create airborne water spray  
while the boat is cruising. Severe engine  
damage may result if the motor is operat-  
ed continuously in the presence of air-  
borne water spray.  
NOTE:  
During water testing check the buoyancy  
of the boat, at rest, with its maximum  
load. Check that the static water level on  
the exhaust housing is low enough to pre-  
vent water entry into the powerhead,  
when water rises due to waves when the  
outboard is not running.  
3-1  
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EMU00176  
MOUNTING THE OUTBOARD  
MOTOR  
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Improper mounting of the outboard  
motor could result in hazardous condi-  
tions such as poor handling, loss of con-  
trol, or fire hazards. Observe the follow-  
ing:  
8 The information presented in this sec-  
tion is intended as reference only. It is  
not possible to provide complete  
instructions for every possible  
boat/motor combination. Proper  
mounting depends in part on experi-  
ence and the specific boat/motor com-  
bination.  
8 Your dealer or other person experi-  
enced in proper rigging should mount  
the motor. If you are mounting the  
motor yourself, you should be trained  
by an experienced person. [permanent  
mounted type]  
8 Your dealer or other person experi-  
enced in proper outboard motor  
mounting should show you how to  
mount your motor. [portable type]  
Mount the outboard motor on the center  
line (keel line) of the boat, and ensure that  
the boat itself is well balanced. Otherwise,  
the boat will be hard to steer. For boats  
without a keel or which are asymmetrical,  
consult your dealer.  
1 Center line (keel line)  
104011  
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3-2  
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Overpowering a boat may cause severe  
instability. Do not install an outboard  
motor with more horsepower than the  
maximum rating on the capacity plate of  
the boat. If the boat does not have a  
capacity plate, consult the boat manufac-  
turer.  
EMU01298  
Mounting Height  
To run your boat at optimum efficiency,  
the water-resistance (drag) of the boat  
and outboard motor must be made as lit-  
tle as possible. The mounting-height of  
the outboard motor greatly affects the  
water-resistance. If the mounting-height  
is too high, cavitation tends to occur, thus  
reducing the propulsion; and if the pro-  
peller tips cut the air, the engine speed  
will rise abnormally and cause the engine  
to overheat. If the mounting-height is too  
low, the water-resistance will increase  
and thereby reduce engine efficiency.  
Mount the engine so that the anti-cavita-  
tion plate is between the bottom of the  
boat and a level 25 mm (1 in.) below it.  
NOTE:  
0~25mm  
(0~1in.)  
8 The optimum mounting height of the  
outboard motor is affected by the  
boat/motor combination and the  
desired use. Test runs at different  
heights can help determine the opti-  
mum mounting height.  
104013*  
8 Refer to the section “TRIMMING OUT-  
BOARD MOTOR” for instructions on  
setting the trim angle of the outboard.  
3-3  
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EMU01318  
CLAMPING THE OUTBOARD MOTOR  
Manual tilt model  
1) Place the outboard on the transom so  
that it is positioned as close to the  
center as possible. Tighten the tran-  
som clamp screws evenly and secure-  
ly. Check the clamp-screws for tight-  
ness occasionally during operation of  
the motor as they can work loose due  
to engine vibration.  
409011  
410012  
409014  
w
Loose clamp screws could allow the  
motor to move on the transom or fall off  
the transom. This could cause loss of  
control and serious injury. Make sure the  
transom screws are tightened securely.  
Occasionally check the screws for tight-  
ness during operation.  
2) An engine restraint cable or chain  
should be used. Attach one end to  
the engine restraint cable attachment  
point and the other to a secure  
mounting point on the boat.  
Otherwise, the engine could be com-  
pletely lost if it accidentally falls off  
the transom.  
q
Secure the clamp bracket to the tran-  
som with the bolts provided with the  
outboard. For details, consult your  
dealer.  
w
Avoid using bolts, nuts or washers other  
than those contained in the engine pack-  
aging. If used, they must be of at least  
the same quality of material and strength  
and must be tightened securely. After  
tightening, test run the engine and check  
their tightness.  
1 Motor mounting parts  
3-4  
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EMU00224  
BREAKING IN (RUNNING IN)  
ENGINE  
Your new engine requires a period of  
break-in (running-in) to allow mating sur-  
faces of moving parts to wear-in evenly.  
Correct break-in (running-in) will help  
ensure proper performance and longer  
engine life.  
cC  
Failure to follow the break-in (running-in)  
procedure may result in reduced engine  
life or even severe engine damage.  
Break-in (running-in) time: 10 hours  
EMU00233  
Run the engine under load (in gear with a  
propeller installed) as follows.  
1) For the first hour of operation:  
Run the engine at 2,000 r/min or at  
approximately half throttle.  
2) For the second hour of operation:  
Run the engine at 3,000 r/min or at  
approximately three-quarter throttle,  
and during this period run it at full  
throttle for approximately one minute  
every ten minutes.  
3) For the next eight hours of operation:  
Avoid continuous operation at full  
throttle for more than five minutes at  
a time.  
4) After these first 10 hours:  
Operate the engine normally.  
3-5  
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EMU00204  
PRE-OPERATION CHECKS  
w
If any item in the pre-operation check is  
not working properly, have it inspected  
and repaired before operating the out-  
board motor. Otherwise, an accident  
could occur.  
cC  
Do not start the engine out of water.  
Overheating and serious engine damage  
can occur.  
EMU00206  
Fuel  
8 Check to be sure you have plenty of fuel  
for your trip.  
8 Make sure there are no fuel leaks or  
gasoline fumes.  
8 Check fuel line connections to be sure  
they are tight.  
8 Be sure the fuel tank is positioned on a  
secure, flat surface, and that the fuel  
hose is not twisted or flattened, or likely  
to contact sharp objects.  
EMU00208  
Oil  
8 Check the level of the oil in the sump  
with the dipstick. If necessary, add oil to  
bring the level up to the upper mark.  
3-6  
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EMU00209  
Controls  
8 Check throttle, shift, and steering for  
proper operation before starting the  
engine.  
8 The controls should work smoothly,  
without binding or unusual free play.  
8 Look for loose or damaged connec-  
tions.  
8 Check operation of the starter and stop  
switches when the outboard motor is in  
the water.  
EMU00210  
Engine  
8 Check the engine and engine mounting.  
8 Look for loose or damaged fasteners.  
8 Check the propeller for damage.  
EMU01436  
CHECKING THE ENGINE OIL LEVEL  
1) Put the outboard motor in an upright  
position (not tilted).  
2) Pull out the oil dipstick and wipe it  
clean.  
q
3) Completely re-insert the dipstick and  
pull out it again.  
4) Check the oil level using the dipstick  
to be sure the level falls between the  
upper and lower marks. Fill with oil if  
it is below the lower mark, or drain to  
the specified level if it is above the  
upper mark.  
201015  
w
e
q
1 Oil dipstick  
2 Lower level mark  
3 Upper level mark  
201012*  
3-7  
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EMU00202  
FILLING FUEL  
1) Remove the fuel tank cap.  
2) Fill the fuel tank carefully.  
3) Close the cap securely after refueling.  
Wipe up any spilled fuel.  
Fuel tank capacity:  
902055  
Refer to SPECIFICATIONS, page 4-1.  
EMU00203  
Ring Free Fuel Additive  
Gasoline is a precise blend of many differ-  
ent substances, each chosen to give cer-  
tain characteristics. Gasoline blends have  
been changing in recent years in  
response to concerns about pollution and  
resulting emissions regulations. One of  
the most obvious changes has been the  
elimination of lead from most fuels.  
As gasoline has changed, the amount of  
additives such as aromatics and oxy-  
genates has increased. These additives  
are important for the engines in passen-  
ger cars, but they can have detrimental  
effects in marine engines, because of  
increased deposits in the combustion  
chamber. When enough deposits collect,  
piston rings begin sticking. Performance  
drops and engine wear increases dramati-  
cally.  
While many additives available may  
reduce deposits, Yamaha recommends  
the use of Ring Free Fuel Additive, avail-  
able from your Yamaha dealer. Ring Free  
has repeatedly proven its ability to clean  
combustion deposits from inside the  
engine, notably the critical piston-ring-  
land area, and fuel system components.  
Follow product labeling for use instruc-  
tions.  
3-8  
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EMU01147  
STARTING ENGINE  
w
8 Before starting the engine, make sure  
that the boat is tightly moored and that  
you can steer clear of any obstructions.  
Be sure there are no swimmers in the  
water near you.  
8 When the air vent screw is loosened,  
gasoline (petrol) vapor will be released.  
Gasoline (petrol) is highly flammable,  
and its vapors are flammable and  
explosive. Refrain from smoking, and  
keep away from open flames and  
sparks while loosening the air vent  
screw.  
8 This product emits exhaust gases  
which contain carbon monoxide, a col-  
orless, odorless gas which may cause  
brain damage or death when inhaled.  
Symptoms include nausea, dizziness,  
and drowsiness. Keep cockpit and  
cabin areas well ventilated. Avoid  
blocking exhaust outlets.  
902053  
304042  
902061  
902025  
1) If there is an air vent screw on the fuel  
tank cap, loosen it 2 or 3 turns.  
2) If there is a fuel joint on the motor,  
firmly connect the fuel line to the  
joint. Then firmly connect the other  
end of the fuel line to the joint on the  
fuel tank.  
NOTE:  
During engine operation place the tank  
horizontally, or fuel cannot be drawn into  
the engine.  
3) Squeeze the primer bulb with the out-  
let end up until you feel it become  
firm.  
3-9  
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EMU01497  
N
PROCEDURE FOR TILLER CONTROL  
MODEL  
4) Place the gear-shift lever in the neu-  
tral position.  
NOTE:  
The start-in-gear protection device pre-  
vents the engine from starting except  
when in Neutral.  
5) Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg. Then, install the lock  
plate on the other end of the lanyard  
in the engine stop switch.  
w
8 Attach the engine stop switch lanyard  
to a secure place on your clothing, your  
arm or leg while operating.  
000648  
8 Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard where it could become entan-  
gled, preventing it from functioning.  
8 Avoid accidentally pulling the lanyard  
during normal operation. Loss of  
engine power means the loss of most  
steering control. Also, without engine  
power, the boat could slow rapidly.  
This could cause people and objects in  
the boat to be thrown forward.  
6) Place the throttle control grip in the  
“START” position.  
START  
START  
3-10  
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EMU01005  
Manual Start Model  
7) Pull the starter handle slowly until  
you feel resistance. Then, give a  
strong pull straight out to crank and  
start the engine. Repeat it, if neces-  
sary.  
NOTE:  
If the warm engine fails to start, open the  
throttle slightly and try to start the engine.  
8) After the engine starts, return the  
starter handle slowly to the original  
position before releasing it.  
EMU00245  
Electric Start Model  
7) Push the starter button to start the  
starting motor.  
8) Immediately the engine starts, release  
the starter-switch to return it to its  
home position.  
cC  
101043**  
8 Do not push the starter-switch when  
the engine is running.  
8 Do not keep the starter-motor turning  
for more than 5 seconds. If the starter-  
motor is run continuously for more  
than 5 seconds, the battery will rapidly  
become exhausted and it will be  
impossible for it to start the engine. If  
the engine does not start within 5 sec-  
onds, release your hand from starter-  
switch, wait 10 seconds, and then  
crank the engine again.  
3-11  
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EMU00247  
N
PROCEDURE FOR REMOTE  
CONTROL MODEL  
4) Place the remote control lever in the  
Neutral position.  
NOTE:  
The start-in-gear protection device pre-  
vents the engine from starting except  
when in Neutral.  
701015  
5) Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg. Then, install the lock  
plate on the other end of the lanyard  
in the engine stop switch.  
w
8 Attach the engine stop switch lanyard  
to a secure place on your clothing, your  
arm or leg while operating.  
000293  
8 Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard where it could become entan-  
gled, preventing from functioning.  
8 Avoid accidentally pulling the lanyard  
during normal operation. Loss of  
engine power means the loss of most  
steering control. Also, without engine  
power, the boat could slow rapidly.  
This could cause people and objects in  
the boat to be thrown forward.  
6) Turn the main switch to “ON”.  
3-12  
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EMU00949  
Electric Start Model  
ON  
7) Turn the main switch to “START”,  
and hold it for a maximum of 5 sec-  
onds.  
OFF  
START  
8) Immediately after the engine starts,  
release the main switch to return it to  
“ON”.  
cC  
701022  
8 Do not turn the main switch to  
“START” when the engine is running.  
8 Do not keep the starter-motor turning  
for more than 5 seconds. The battery  
will rapidly become exhausted and it  
will be impossible for it to start the  
engine. If the engine does not start  
within 5 seconds, return the main  
switch to “ON”, wait 10 seconds, and  
then crank the engine again.  
3-13  
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EMU00258  
WARMING UP ENGINE  
1) Before beginning operation, allow the  
engine to warm up at idling speed for  
3 minutes. (Failure to do this will  
shorten engine life.)  
2) Be sure the low oil pressure warning  
indicator goes off after starting the  
engine.  
309016  
3) Check for a steady flow of water from  
the cooling-water pilot hole.  
cC  
8 If the low oil pressure indicator does  
not go off after the engine starts, stop  
the engine. Otherwise, serious engine  
damage could occur. Check the oil level  
and add oil if necessary. If the cause for  
the low oil pressure warning indicator  
cannot be found, consult your Yamaha  
dealer.  
8 A continuous flow of water from the  
pilot hole shows that the water pump  
is pumping water through the cooling  
passages. If water is not flowing out of  
the pilot hole at all times while the  
engine is running, do not continue to  
run the engine. Overheating and seri-  
ous damage could occur. Stop the  
engine and check to see if the water  
inlet on the lower casing is blocked. If  
the problem cannot be found and cor-  
rected, consult your Yamaha dealer.  
3-14  
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EMU00261  
SHIFTING  
w
Before shifting, make sure there are no  
swimmers or obstacles in the water near  
you.  
cC  
To change the shifting position from for-  
ward to reverse or vice-versa, close the  
throttle first so that the engine idles (or  
runs at low speeds).  
START  
EMU00265  
FORWARD  
Tiller control model  
1) Place the throttle control grip in the  
fully closed position.  
2) Turn the gear-shift lever quickly and  
firmly from Neutral to Forward.  
N
F
Remote control model  
N
F
Pull up the neutral interlock trigger if  
equipped and move the remote control  
lever quickly and firmly from Neutral to  
Forward.  
701043  
3-15  
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EMU01326  
REVERSE  
w
When operating in Reverse, go slowly. Do  
not open the throttle more than half.  
Otherwise, the boat may become unsta-  
ble, which could result in loss of control  
and an accident.  
START  
1) Place the throttle control grip in the  
fully closed position (for Tiller control  
model).  
2) Check that the tilt-lock lever (for  
Manual tilt/Hydro-tilt model) is in the  
locked position.  
402073*  
Tiller control model  
R
3) Turn the gear-shift lever quickly and  
firmly from Neutral to Reverse.  
N
Remote control model  
N
R
3) Pull up the neutral interlock trigger if  
equipped and move the remote con-  
trol lever quickly and firmly from  
Neutral to Reverse.  
701044  
3-16  
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EMU00273  
STOPPING ENGINE  
Let it cool off for a few minutes at idle or  
low speed first. Stopping the engine  
immediately after operating at high speed  
is not recommended.  
506021  
EMU00277  
ON  
1) Push and hold the engine stop button  
or turn the main switch to “OFF”.  
START  
OFF  
701023  
2) If the fuel joints are provided, discon-  
nect the fuel line from the motor after  
stopping the engine.  
304043  
3) Tighten the air vent screw on the fuel  
tank cap after stopping the engine, if  
it is equipped.  
4) Remove the key if the boat will be left  
unattended.  
NOTE:  
The engine can also be stopped by  
pulling the lanyard and removing the lock  
plate from the engine stop lanyard switch  
(then turning the main switch to “OFF”).  
902052  
3-17  
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EMU01412  
TRIMMING OUTBOARD  
MOTOR  
The trim angle of the outboard motor  
helps determine the position of the bow  
of the boat in the water. The correct trim  
angle will help improve performance and  
fuel economy while reducing strain on the  
engine. The correct trim angle depends  
upon the combination of boat, engine,  
and propeller. Correct trim is also affected  
by variables such as the load in the boat,  
sea conditions, and running speed.  
w
Excessive trim for the operating condi-  
tions (either trim up or trim down) can  
cause boat instability and can make  
steering the boat more difficult. This  
increases the possibility of an accident. If  
the boat begins to feel unstable or is hard  
to steer, slow down and/or readjust the  
trim angle.  
NOTE:  
Refer to the section “ADJUSTING TRIM  
ANGLE” for instructions on usage.  
q
000910  
1 Trim operating angle  
3-18  
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ADJUSTING TRIM ANGLE  
EMU00951*  
Manual tilt model  
There are 4 or 5 holes provided in the  
clamp bracket to adjust the outboard  
motor trim angle.  
1) Stop the engine.  
q
2) Remove the trim angle adjusting rod  
1 from the clamp bracket while tilting  
the motor up slightly.  
404012*  
3) Reposition the rod in the desired hole.  
To raise the bow (“trim-out”), move the  
rod away from the transom.  
To lower the bow (“trim-in”), move the  
rod toward the transom.  
Make test runs with the trim set to differ-  
ent angles to find the position that works  
best for your boat and operating condi-  
tions.  
w
8 Stop the engine before adjusting the  
trim angle.  
8 Use care to avoid being pinched when  
removing or installing the rod.  
8 Use caution when trying a trim position  
for the first time. Increase speed gradu-  
ally and watch for any signs of instabili-  
ty or control problems. Improper trim  
angle can cause loss of control.  
NOTE:  
The outboard motor trim angle can be  
changed approximately 4 degrees by  
shifting the trim adjusting-rod one hole.  
3-19  
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EMU01401  
Power Trim/Tilt Model  
UP  
DN  
UP  
DN  
w
8 Be sure all people are clear of the out-  
board motor when adjusting the  
trim/tilt angle, also be careful not to  
pinch any body parts between the drive  
unit and clamp bracket.  
q
701034**  
8 Use caution when trying a trim position  
for the first time. Increase speed gradu-  
ally and watch for any signs of instabili-  
ty or control problems.  
8 Use the power trim/tilt switch located  
on the bottom engine cowling (if  
equipped) only when the boat is at a  
complete stop with the engine off.  
The outboard motor trim angle can be  
adjusted operating the power trim/tilt  
switch 1.  
To raise the bow (“trim-out”), push the  
switch UP.  
To lower the bow (“trim-in”), push the  
switch DN.  
Make test runs with the trim set to differ-  
ent angles to find the position that works  
best for your boat and operating condi-  
tions.  
NOTE:  
To adjust the trim angle while the boat is  
moving, use the power trim and tilt  
switch located on the remote control  
device or tiller handle, if so equipped.  
3-20  
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EMU00282  
Bow Up  
When the boat is on plane, a bow-up atti-  
tude result in less drag, greater stability  
and efficiency. This is generally when the  
keel line of the boat is up about 3 to 5  
degrees. When trimmed out, the boat  
may have more tendency to steer to one  
side or the other. Compensate for this as  
you steer. The trim tab can also be adjust-  
ed to help offset this effect.  
q
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Too much trim-out puts the bow of the  
boat too high in the water. Performance  
and economy are decreased because the  
hull of the boat is pushing the water and  
there is more air drag.  
Excessive trim-up can cause the propeller  
to ventilate, which reduces performance  
further. When trimmed-out too much, a  
boat may “porpoise” (hop in the water),  
which could throw the operator and pas-  
sengers overboard.  
105011  
105013  
105015  
EMU00283  
Bow Down  
When the bow of the boat is down, it is  
easier to accelerate from a standing start  
onto plane.  
Too much trim-in causes the boat to  
“plow” through the water, decreasing  
fuel economy and making in hard to  
increase speed.  
Operating with excessive trim-in at higher  
speeds also makes the boat unstable.  
Resistance at the bow is greatly  
increased, heightening the danger of  
“bow steering” and making operation dif-  
ficult and dangerous.  
1 Bow up  
2 Bow down  
3 Optimum angle  
3-21  
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EMU00285  
TILTING UP/DOWN  
If the engine will be stopped for some  
time, or if the boat is moored in shallows,  
the engine should be tilted up to protect  
the propeller and casing from damage by  
collision with obstructions, and also to  
reduce salt corrosion.  
105031  
cC  
8 Before tilting the motor, follow the pro-  
cedures under “STOPPING ENGINE”.  
Never tilt the motor while the engine is  
running. Severe damage from over-  
heating can result.  
8 Do not tilt up the engine by pushing  
the steering handle as this could break  
the handle.  
w
Be sure all people are clear of the out-  
board motor when adjusting the tilt  
angle, also be careful not to pinch any  
body parts between the drive unit and  
engine bracket.  
w
Leaking fuel is a fire hazard. Disconnect  
the fuel line if the engine will be tilted for  
more than a few minutes. Otherwise, fuel  
may leak. (If the fuel connector is provid-  
ed on the motor.)  
3-22  
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EMU00290  
PROCEDURE FOR TILTING UP  
Manual tilt model  
1) Place the gear shift lever in Neutral.  
2) Remove the fuel line connection from  
the motor.  
304043  
402071  
403052  
402074  
3) Place the tilt lock lever in the release  
position.  
4) Hold the rear of the top cowling with  
one hand and fully tilt the engine up.  
5) The tilt support bar turns to the  
locked position automatically.  
EMU00300  
PROCEDURE FOR TILTING DOWN  
Manual tilt model  
1) Place the tilt lock lever in the lock  
position.  
2) Slightly tilt up the engine until the tilt  
support bar is released automatically.  
3) Tilt down the engine.  
3-23  
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EMU00296  
PROCEDURE FOR TILTING UP  
Power trim/tilt model  
1) Remove the fuel-line connection from  
the motor.  
304043  
2) Push the power trim/tilt switch “UP”  
until the outboard has tilted up com-  
pletely.  
UP  
DN  
UP  
DN  
701034*  
3) Push the tilt support knob into the  
clamp bracket to support the engine.  
w
After tilting the engine, be sure to sup-  
port it with the tilt support knob.  
Otherwise, the engine could fall back  
down suddenly if oil in the power  
trim/tilt unit should lose pressure.  
403054  
EMU00305  
PROCEDURE FOR TILTING DOWN  
Power trim/tilt model  
1) Push the power trim/tilt switch “UP”  
until the engine is supported by the  
tilt rod.  
2) Pull out the tilt support knob.  
3) Push the power trim/tilt switch “DN”  
(Down) to lower the engine to the  
desired position.  
3-24  
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EMU00306  
CRUISING IN SHALLOW  
WATER  
Manual tilt model  
The outboard motor can be tilted up par-  
tially to allow operation in shallow water.  
w
8 Place the gear shift in the Neutral posi-  
tion before using the shallow water  
cruising system.  
8 Run the boat at the lowest possible  
speed when using the shallow water  
cruising system. The tilt-lock mecha-  
nism does not work while the shallow  
water cruising system is being used.  
Hitting an underwater obstacle could  
cause the engine to lift out of the  
water, resulting in loss of control.  
8 Use extra care when operating in  
reverse. Too much reverse thrust can  
cause the engine to lift out of the  
water, increasing the chance of acci-  
dent and personal injury.  
000911  
8 Return the engine to its normal posi-  
tion as soon as the boat is back in  
deeper water.  
cC  
Place the gear-shift in the Neutral posi-  
tion before using the shallow water cruis-  
ing system.  
3-25  
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EMU00310  
N
PROCEDURE  
1) Place the gear shift lever in the neu-  
tral position.  
2) Place the tilt lock lever in the release  
position.  
402071  
403051  
402074  
3) Slightly tilt up the engine. The tilt-  
support bar will lock automatically,  
supporting the engine in a partially  
raised position.  
NOTE:  
This motor has 2 positions for shallow  
water cruising.  
RETURNING TO ORIGINAL POSITION  
1) Place the tilt lock lever in the lock  
position.  
2) Slightly tilt up the engine until the tilt-  
support bar automatically returns to  
the free position.  
3) Then, slowly lower the engine to the  
normal position.  
3-26  
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EMU00316  
CRUISING IN OTHER  
CONDITIONS  
CRUISING IN SALT WATER  
After operating in salt water, wash out the  
cooling-water passages with fresh water  
to prevent them from becoming clogged-  
up with salt deposits.  
NOTE:  
Refer to cooling system flushing instruc-  
tions in “TRANSPORTING AND STORING  
OUTBOARD MOTOR”.  
CRUISING IN TURBID WATER  
It is strongly recommended that the  
optional chromium-plated water-pump kit  
be installed if the outboard is to be used  
in turbid (muddy) water conditions.  
3-27  
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EMU00317  
Chapter 4  
1
2
3
4
5
MAINTENANCE  
SPECIFICATIONS .....................................4-1  
TRANSPORTING AND STORING  
OUTBOARD MOTOR ...............................4-4  
Trailering outboard motor ...................4-4  
Storing outboard motor.......................4-5  
PERIODIC MAINTENANCE....................4-10  
Replacement parts..............................4-10  
Maintenance chart ..............................4-11  
Greasing...............................................4-12  
Cleaning and adjusting spark plug ...4-14  
Checking fuel system .........................4-16  
Inspecting fuel filter............................4-17  
Adjusting idling speed .......................4-18  
Changing engine oil............................4-19  
Checking timing belt...........................4-21  
Replacing fuse.....................................4-22  
Checking wiring and connectors.......4-22  
Exhaust leakage ..................................4-22  
Water leakage......................................4-22  
Checking power trim and tilt  
system..................................................4-23  
Checking propeller..............................4-24  
Changing gear oil................................4-26  
Cleaning fuel tank ...............................4-28  
Inspecting and replacing anode(s)....4-29  
Checking battery .................................4-30  
Checking bolts and nuts.....................4-32 6  
Cleaning cooling-water passages.....4-33  
Motor exterior .....................................4-34  
Coating the boat bottom....................4-34  
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EMU00322*  
SPECIFICATIONS  
Model  
Unit  
F25MHB  
Item  
DIMENSIONS  
Overall Length  
Overall Width  
Overall Height  
Transom height  
Weight  
mm (in.)  
mm (in.)  
mm (in.)  
mm (in.)  
kg (lb.)  
1,151 (45.3)  
430 (16.9)  
1,148 (45.2)/1,275 (50.2)/1,354(53.5)  
423 (16.7)/550 (21.7)/636(25.0)  
62 (137)/64 (141)/66(146)  
S/L/X  
S/L/X  
S/L/X  
PERFORMANCE  
Full throttle operating range  
Maximum output  
Idling speed (Neutral)  
r/min  
kW (HP) @ r/min  
r/min  
5,000–6,000  
18.4 (25.0) @ 5,500  
925–1,025  
ENGINE  
Type  
4-stroke, OHC, L2  
498 (30.39)  
65.0 × 75.0 (2.56 × 2.95)  
CDI system  
3
Displacement  
Bore × stroke  
Ignition system  
Spark plug  
cm (cu.in.)  
mm (in.)  
NGK  
DPR6EA-9  
Spark plug gap  
Control system  
Starting system  
mm (in.)  
0.8–0.9 (0.031–0.035)  
Tiller control  
Manual recoil starter  
0.15–0.25 (0.006–0.010)  
0.25–0.35 (0.010–0.014)  
Valve clearance (cold engine) IN  
mm (in.)  
mm (in.)  
EX  
Battery  
Min. cold cranking amps (CCA/SAE) amps at -18°C (-0.4°F)  
—
Min. marine cranking amps (MCA/ABYC)  
Min. reserve capacity (RC/SAE)  
Alternator output  
amps at 0°C (32°F)  
minutes  
—
—
V-A (W)  
12-(80)  
Prime start  
Starting carburetion system  
DRIVE UNIT  
Gear positions  
Gear ratio  
Trim and tilt system  
Propeller mark  
Forward-Neutral-Reverse  
2.08 (27/13)  
Manual  
F
FUEL AND OIL  
Recommended fuel  
Regular unleaded gasoline  
(Minimum 86)  
P.O.N.  
Fuel tank capacity  
I (US gal, lmp qt)  
25 (6.60, 5.50)  
Recommended engine oil  
4-stroke motor oil  
SE, SF, SG, SH, SJ  
10W-30, 10W-40  
1.7 (1.80, 1.50)  
API  
SAE  
I (US qt, Imp qt)  
I (US qt, Imp qt)  
Engine oil capacity (without oil filter)  
(with oil filter)  
1.9 (2.00, 1.67)  
Recommended gear oil  
Gear oil capacity  
Hypoid gear oil (SAE90)  
320 (10.81, 11.27)  
3
cm (US oz, Imp oz)  
TIGHTENING TORQUE  
18 (1.8, 13)  
35 (3.5, 25)  
28 (2.8, 20)  
18 (1.8, 13)  
Spark plug  
Propeller nut  
Engine oil drain bolt  
Engine oil filter  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
4-1  
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F25EHB  
F25ERB  
F25TRB  
1,151 (45.3)  
430 (16.9)  
703 (27.7)  
376 (14.8)  
703 (27.7)  
376 (14.8)  
1,148 (45.2)/1,275 (50.2)/1,354 (53.3) 1,148 (45.2)/1,275 (50.2)/—  
—/1,275 (50.2)/—  
—/550 (21.7)/—  
—/71 (157)/—  
423 (16.7)/550 (21.7)/636 (25.0)  
66 (146)/68 (150)/70 (154)  
423 (16.7)/550 (21.7)/—  
65 (143)/67 (148)/—  
5,000–6,000  
5,000–6,000  
5,000–6,000  
18.4 (25.0) @ 5,500  
875–975  
18.4 (25.0) @ 5,500  
875–975  
18.4 (25.0) @ 5,500  
875–975  
4-stroke, OHC, L2  
498 (30.39)  
4-stroke, OHC, L2  
498 (30.39)  
4-stroke, OHC, L2  
498 (30.39)  
65.0 × 75.0 (2.56 × 2.95)  
CDI system  
65.0 × 75.0 (2.56 × 2.95)  
CDI system  
65.0 × 75.0 (2.56 × 2.95)  
CDI system  
DPR6EA-9  
DPR6EA-9  
DPR6EA-9  
0.8–0.9 (0.031–0.035)  
Tiller control  
Electric start  
0.8–0.9 (0.031–0.035)  
Remote control  
Electric start  
0.8–0.9 (0.031–0.035)  
Remote control  
Electric start  
0.15–0.25 (0.006–0.010)  
0.25–0.35 (0.010–0.014)  
0.15–0.25 (0.006–0.010)  
0.25–0.35 (0.010–0.014)  
0.15–0.25 (0.006–0.010)  
0.25–0.35 (0.010–0.014)  
245  
245  
245  
323  
323  
323  
52  
52  
52  
12-15  
Prime start  
12-15  
Prime start  
12-15  
Prime start  
Forward-Neutral-Reverse  
Forward-Neutral-Reverse  
Forward-Neutral-Reverse  
2.08 (27/13)  
Power trim and tilt  
F
2.08 (27/13)  
Manual tilt  
F
2.08 (27/13)  
Manual tilt  
F
Regular unleaded gasoline  
(Minimum 86)  
Regular unleaded gasoline  
(Minimum 86)  
Regular unleaded gasoline  
(Minimum 86)  
25 (6.60, 5.50)  
25 (6.60, 5.50)  
25 (6.60, 5.50)  
4-stroke motor oil  
SE, SF, SG, SH, SJ  
10W-30, 10W-40  
1.7 (1.80, 1.50)  
4-stroke motor oil  
SE, SF, SG, SH, SJ  
10W-30, 10W-40  
1.7 (1.80, 1.50)  
4-stroke motor oil  
SE, SF, SG, SH, SJ  
10W-30, 10W-40  
1.7 (1.80, 1.50)  
1.9 (2.00, 1.67)  
1.9 (2.00, 1.67)  
1.9 (2.00, 1.67)  
Hypoid gear oil (SAE90)  
320 (10.81, 11.27)  
Hypoid gear oil (SAE90)  
320 (10.81, 11.27)  
Hypoid gear oil (SAE90)  
320 (10.81, 11.27)  
18 (1.8, 13)  
35 (3.5, 25)  
28 (2.8, 20)  
18 (1.8, 13)  
18 (1.8, 13)  
35 (3.5, 25)  
28 (2.8, 20)  
18 (1.8, 13)  
18 (1.8, 13)  
35 (3.5, 25)  
28 (2.8, 20)  
18 (1.8, 13)  
4-2  
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EMU00322*  
SPECIFICATIONS  
Model  
Unit  
T25TRB  
Item  
DIMENSIONS  
Overall Length  
Overall Width  
Overall Height  
Transom height  
Weight  
mm (in.)  
mm (in.)  
mm (in.)  
mm (in.)  
kg (lb.)  
713 (28.1)  
373 (14.7)  
—/1,311 (51.6)/1,425 (56.1)  
—/528 (20.8)/642 (25.3)  
—/87 (192)/90 (198)  
S/L/X  
S/L/X  
S/L/X  
PERFORMANCE  
Full throttle operating range  
Maximum output  
Idling speed (Neutral)  
r/min  
kW (HP) @ r/min  
r/min  
5,000–6,000  
18.4 (25.0) @ 5,500  
925–1,025  
ENGINE  
Type  
4-stroke, OHC, L2  
498 (30.39)  
65.0 × 75.0 (2.56 × 2.95)  
CDI system  
3
Displacement  
Bore × stroke  
Ignition system  
Spark plug  
cm (cu.in.)  
mm (in.)  
NGK  
DPR6EA-9  
Spark plug gap  
Control system  
Starting system  
mm (in.)  
0.8–0.9 (0.031–0.035)  
Remote control  
Electric start  
Valve clearance (cold engine) IN  
mm (in.)  
mm (in.)  
0.15–0.25 (0.006–0.010)  
0.25–0.35 (0.010–0.014)  
EX  
Battery  
Min. cold cranking amps (CCA/SAE) amps at -18°C (-0.4°F)  
245  
Min. marine cranking amps (MCA/ABYC)  
Min. reserve capacity (RC/SAE)  
Alternator output  
amps at 0°C (32°F)  
minutes  
323  
52  
12-15  
Prime start  
V-A (W)  
Starting carburetion system  
DRIVE UNIT  
Gear positions  
Gear ratio  
Forward-Neutral-Reverse  
2.42 (29/12)  
Trim and tilt system  
Propeller mark  
Power trim and tilt  
G
FUEL AND OIL  
Recommended fuel  
Regular unleaded gasoline  
(Minimum 86)  
P.O.N.  
Fuel tank capacity  
I (US gal, lmp qt)  
25 (6.60, 5.50)  
Recommended engine oil  
4-stroke motor oil  
SE, SF, SG, SH, SJ  
10W-30, 10W-40  
1.9 (2.00, 1.67)  
API  
SAE  
I (US qt, Imp qt)  
I (US qt, Imp qt)  
Engine oil capacity (without oil filter)  
(with oil filter)  
2.1 (2.22, 1.85)  
Recommended gear oil  
Gear oil capacity  
Hypoid gear oil (SAE90)  
430 (14.54, 15.14)  
3
cm (US oz, Imp oz)  
TIGHTENING TORQUE  
18 (1.8, 13)  
35 (3.5, 25)  
28 (2.8, 20)  
18 (1.8, 13)  
Spark plug  
Propeller nut  
Engine oil drain bolt  
Engine oil filter  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
N·m (kgf·m, lb·ft)  
4-3  
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EMU01369  
TRANSPORTING AND  
STORING OUTBOARD MOTOR  
w
Leaking fuel is a fire hazard. When trans-  
porting and storing the outboard motor,  
close the air vent screw and fuel cock to  
prevent fuel from leaking.  
EMU00326  
TRAILERING OUTBOARD MOTOR  
The motor should be trailered and stored  
in the normal running position. If there is  
insufficient road clearance in this position,  
then trailer the motor in the tilt position  
using a motor support device such as a  
transom saver bar.  
For further details, consult your Yamaha  
dealer.  
001213  
w
8 Never get under the lower unit while it  
is tilted, even if a motor support bar is  
used. Severe injury could occur if the  
outboard accidentally falls.  
8 USE CARE when transporting fuel tank,  
whether in a boat or car.  
8 DO NOT fill fuel container to maximum  
capacity. Gasoline will expand consid-  
erably as it warms up and can build up  
pressure in the fuel container. This can  
cause fuel leakage and a potential fire  
hazard.  
cC  
Do not use the tilt support lever/knob  
when trailering the boat. The outboard  
motor could shake loose from the tilt  
support and fall. If the motor can not be  
trailered in the down position, use an  
additional support device to secure it in  
the up position.  
4-4  
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EMU00330  
STORING OUTBOARD MOTOR  
When storing your Yamaha outboard for  
prolonged periods of time, (2 months or  
longer), several important procedures  
must be performed to prevent expensive  
damage.  
It is advisable to have your outboard ser-  
viced by an authorized Yamaha dealer  
prior to storage. However, the following  
procedures can be performed by you, the  
owner, with a minimum of tools.  
q
cC  
8 To prevent problems which can be  
caused by oil entering the cylinder from  
the sump, keep the engine in the atti-  
tude shown when transporting and  
storing it.  
8 Do not place the engine on its side  
before the cooling water has drained  
from it completely, or water may enter  
the cylinder through the exhaust port  
and cause problems.  
000912  
w
8 Store the engine in a dry, well-ventilat-  
ed place, not in direct sunlight.  
1 Vertical position  
2 Horizontal position  
EMU00335  
102**2  
Filling Fuel Tank  
Fill the fuel tank with fresh fuel and add  
one ounce of “Yamaha Fuel Conditioner  
and Stabilizer” (Part No. LUB-FUELC-12-  
00) to each gallon of fuel.  
NOTE:  
The use of “Yamaha Fuel Conditioner and  
Stabilizer” eliminates the need to drain  
the fuel system. Consult your Yamaha  
dealer or other qualified mechanic if the  
fuel system is to be drained instead.  
4-5  
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EMU00338  
Flushing Cooling System and Fogging  
Engine  
Cooling system flushing is essential to  
prevent the cooling system from clogging  
up with salt, sand, or dirt. In addition, fog-  
ging of the engine is mandatory to pre-  
vent expensive engine damage due to  
rust. Perform the flushing and fogging at  
the same time.  
w
8 Do not touch or remove electrical parts  
when starting or during operation.  
8 Keep hands, hair and clothes away  
from flywheel and other rotating parts  
while engine is running.  
EMU00339  
8 Flushing in a Water Tank  
cC  
If the fresh water level is below the level  
of the anti-cavitation plate, or if the water  
supply is insufficient, engine seizure may  
occur.  
1) Remove the engine top cowling and  
silencer cover.  
2) Install the outboard motor on the  
water tank.  
3) Fill the tank with fresh water to above  
the level of the anti-cavitation plate.  
4) Run the engine at a fast idle for 10~15  
minutes.  
5) Just prior to turning off the engine,  
quickly spray “Yamaha Stor-Rite  
Engine Fogging Oil” (Part No. LUB-  
STRRT-12-00) alternately into each  
carburetor. When properly done, the  
engine will smoke excessively and  
almost stall.  
4-6  
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6) Remove the motor from the water  
tank.  
7) Install the silencer cover and top  
cowling.  
q
w
1 Water surface  
2 Lowest water level  
605024  
EMU00342  
8 Flushing with the Flushing Attachment  
q
cC  
Avoid running the outboard at high  
speed while on the flushing attachment,  
or overheating could occur.  
1) Remove the top cowling and the pro-  
peller.  
605014*  
2) Install a flushing attachment 1 to the  
cooling water inlet.  
3) Run the engine at a fast idle for 10~15  
minutes supplying fresh water.  
4) Just prior to turning off the engine,  
quickly spray “Yamaha Stor-Rite  
Engine Fogging Oil” (Part No. LUB-  
STRRT-12-00) alternately into the  
silencer cover. When properly done,  
the engine will smoke excessively  
and almost stall.  
5) Remove the flushing attachment and  
wipe off any excess water.  
6) Install the top cowling and the pro-  
peller.  
NOTE:  
A flushing attachment is available from a  
Yamaha dealer.  
4-7  
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EMU00349  
Lubrication  
1) Remove the spark plug(s). Spray a  
Yamaha “Stor-Rite Engine Fogging  
Oil” into each cylinder for 10 seconds.  
Grease the spark plug threads and  
reinstall the spark plug(s) and torque  
to proper specification. (Refer to the  
“CLEANING AND ADJUSTING  
SPARK PLUG”).  
2) Turn the engine over with the stop  
lanyard disconnected to work the fog-  
ging oil into the piston rings.  
3) Change the gear-case oil. (Refer to  
“CHANGING GEAR OIL”). Inspect the  
oil for the presence of water which  
indicates a leaky seal. Seal replace-  
ment should be performed by an  
authorized Yamaha dealership prior  
to use.  
4) Grease all grease fittings. (Refer to  
the “GREASING”)  
EMU00351  
Cleaning and Anti-corrosion Measure  
1) Wash down the exterior of the out-  
board with fresh water and dry off  
completely.  
2) Spray the engine’s exterior with  
“Yamaha Silicone Protectant” (Part  
No. LUB-SILCNE-13-00).  
3) Wax the cowling with a non-abrasive  
wax such as “Yamaha Silicone Wax”  
(Part No. ACC-11000-15-02).  
4-8  
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EMU00353  
Battery Care  
w
Battery electrolyte is poisonous and dan-  
gerous, causing severe burns, etc. It con-  
tains sulfuric acid. Avoid contact with  
skin, eyes, or clothing.  
Antidote:  
EXTERNAL; Flush with water.  
INTERNAL; Drink large quantities of  
water or milk. Follow with milk of mag-  
nesia, beaten egg, or vegetable oil. Call  
physician immediately.  
EYES; Flush with water for 15 minutes  
and get prompt medical attention.  
Batteries produce explosive gases: Keep  
sparks, flame, cigarettes, etc. away.  
Ventilate when charging or using in a  
closed space. Always wear eye protection  
when working near batteries.  
KEEP OUT OF REACH OF CHILDREN.  
Batteries vary among manufacturers.  
Therefore the following procedures may  
not always apply. Consult your battery  
manufacturer’s instructions.  
1) Disconnect and remove the battery  
from the boat. Always disconnect the  
black negative lead first to prevent the  
risk of shorting.  
2) Clean the battery casing and termi-  
nals. Fill each cell to the upper level  
with distilled water.  
3) Store the battery on a level surface in  
a cool, dry, well-ventilated place out  
of direct sunlight.  
4) Once a month, check the specific  
gravity of the electrolyte and recharge  
as required to prolong battery life.  
UPPER LEVEL  
LOWER LEVEL  
901015  
4-9  
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EMU01569  
PERIODIC MAINTENANCE  
w
Be sure to turn off the engine when you  
perform maintenance unless otherwise  
specified. If the owner is not familiar with  
machine servicing, this work should be  
done by a Yamaha dealer or other quali-  
fied mechanic.  
Maintenance, replacement, or repair of  
the emission control devices and systems  
may be performed by any marine engine  
repair establishment or individual. All  
warranty repairs, however, including  
those to the emission control system,  
must be performed by an authorized  
Yamaha marine dealership.  
A service manual is available for purchase  
through a Yamaha dealer for owners who  
have the mechanical skills, tools, and  
other equipment necessary to perform  
maintenance not covered by this owner’s  
manual.  
EMU00356  
REPLACEMENT PARTS  
If replacement parts are necessary, use  
only genuine Yamaha parts or equiva-  
lents of the same type and of equivalent  
strength and materials. Any part of inferi-  
or quality may malfunction, and the  
resulting loss of control could endanger  
the operator and passengers.  
Yamaha genuine parts and accessories  
are available from a Yamaha dealer.  
4-10  
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EMU00361*  
MAINTENANCE CHART  
Frequency of maintenance operations may be adjusted according to the operating con-  
ditions, but the following table gives general guidelines.  
The mark (G) indicates the check-ups which you may carry out yourself.  
The mark (1) indicates work to be carried out by your Yamaha dealer.  
Initial  
10 hours 50 hours 100 hours 200 hours  
(1 month) (3 months) (6 months) (1 year)  
Every  
Interval  
Refer  
page  
Item  
Cleaning/Adjustment/  
Replacement  
Spark plug  
G
G
G
4-14  
Greasing points  
Gear oil  
Fuel system  
Fuel filter  
Fuel tank  
Idling speed  
Anode  
Greasing  
Change  
Inspection  
Inspection/Replacement  
Cleaning  
G
G
G
G
4-12  
4-26  
4-16  
4-17  
4-28  
4-18  
4-29  
4-34  
G
G
G
G
G
Adjustment  
Inspection/Replacement  
G
1
G
1
G
Outboard motor exterior Inspection  
Cooling water passages  
Propeller  
Timing belt  
Cleaning  
Inspection  
Inspection  
G
G
4-6, 4-33  
4-24  
4-21  
G
G
1
G (every  
month)  
Battery  
Inspection  
4-30  
Power trim and tilt  
Ignition timing  
Bolts and nuts  
Engine oil  
Oil filter  
Valve clearance  
Thermostat  
Inspection  
G
1
1
G
G
G
4-23  
—
4-32  
4-19  
—
Inspection/Adjustment  
Retightening  
Change  
Change  
Inspection/Adjustment  
Inspection  
1
1
G
1
1
1
1
—
—
1. When operating in salt water, turbid or muddy water, the engine should be flushed with clean  
water after each use.  
NOTE:  
If leaded gasoline is usually used, engine valves and related parts should be inspected  
after every 300 hours of operation in addition to the items on the maintenance chart  
above.  
4-11  
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EMU00366  
GREASING  
Yamaha marine grease  
(Water resistant grease)  
4-12  
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EMU00366  
GREASING  
Yamaha marine grease  
(Water resistant grease)  
103182  
4-13  
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EMU01202  
CLEANING AND ADJUSTING SPARK  
PLUG  
w
When removing or installing a spark plug,  
be careful not to damage the insulator. A  
damaged insulator could allow external  
sparks, which could lead to explosion or  
fire.  
The spark plug is an important engine  
component and is easy to inspect. The  
condition of the spark plug can indicate  
something about the condition of the  
engine. For example, if the center elec-  
trode porcelain is very white, this could  
indicate an intake air leak or carburetion  
problem in that cylinder. Do not attempt  
to diagnose any problems yourself.  
Instead, take the outboard motor to a  
Yamaha dealer. You should periodically  
remove and inspect the spark plug  
because heat and deposits will cause the  
spark plug to slowly break down and  
erode. If electrode erosion becomes  
excessive, or if carbon and other deposits  
are excessive, you should replace the  
spark plug with another of the correct  
type.  
Standard spark plug:  
Refer to “SPECIFICATIONS”, page 4-1.  
Before fitting the spark plug, measure the  
electrode gap with a wire thickness  
gauge; adjust the gap to specification if  
necessary.  
Spark plug gap:  
Refer to “SPECIFICATIONS”, page 4-1.  
4-14  
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When fitting the plug, always clean the  
gasket surface and use a new gasket.  
Wipe off any dirt from the threads and  
screw in the spark plug to the correct  
torque.  
Spark plug torque:  
Refer to “SPECIFICATIONS”, page 4-1.  
NOTE:  
If a torque-wrench is not available when  
you are fitting a spark plug, a good esti-  
mate of the correct torque is 1/4 to 1/2 a  
turn past finger-tight. Have the spark plug  
adjusted to the correct torque as soon as  
possible with a torque-wrench.  
Initial of spark plug  
Plug wrench size  
q
I.D. mark  
w
903033  
B
21 mm (13/16 in.)  
16 mm (5/8 in.)  
C/BK  
D
18.3 mm (23/32 in.)  
1 Spark plug gap  
2 Spark plug I.D. mark (NGK)  
4-15  
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EMU00369  
CHECKING FUEL SYSTEM  
w
Gasoline (petrol) and its vapors are highly  
flammable and explosive. Keep away  
from sparks, cigarettes, flames or other  
sources of ignition.  
Check the fuel line for leaks, cracks, or  
malfunctions. If any problem is found, it  
should be repaired immediately by  
Yamaha dealer or other qualified mechan-  
ic.  
Checking points  
8 Fuel system parts leakage.  
8 Fuel hose joint leakage.  
8 Fuel hose cracks or other damage.  
8 Fuel connector leakage.  
106055  
w
Leaking fuel can result in fire or explo-  
sion.  
8 Check for fuel leakage regularly.  
8 If any fuel leakage is found, the fuel  
system must be repaired by a qualified  
mechanic. Improper repairs can make  
the outboard unsafe to operate.  
4-16  
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EMU00370  
INSPECTING FUEL FILTER  
w
Gasoline (petrol) is highly flammable, and  
its vapors are flammable and explosive.  
8 If you have any question about properly  
doing this procedure, consult your  
Yamaha dealer.  
8 Do not perform this procedure on a hot  
or running engine. Allow the engine to  
cool.  
8 There will be fuel in the fuel filter. Keep  
away from sparks, cigarettes, flames or  
other sources of ignition.  
8 This procedure will allow some fuel to  
spill. Catch fuel in a rag. Wipe up any  
spilled fuel immediately.  
8 The fuel filter must be reassembled  
carefully with O-ring, filter cup, and  
hoses in place. Improper assembly or  
replacement can result in a fuel leak,  
which could result in a fire or explosion  
hazard.  
207053  
EMU00374  
Check the fuel filter periodically.  
The fuel filter is a one-piece, disposable  
type. If foreign matter is found in the fil-  
ter, replace it. For replacement of the fuel  
filter, consult a Yamaha dealer.  
4-17  
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EMU00991  
ADJUSTING IDLING SPEED  
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8 Do not touch or remove electrical parts  
when starting or during operation.  
8 Keep hands, hair and clothes away  
from flywheel and other rotating parts  
while engine is running.  
cC  
This procedure must be performed while  
the outboard motor is in the water. A  
flushing attachment or test tank can be  
used.  
A diagnostic tachometer should be used  
for this procedure.  
1) Start the engine and allow it to warm  
up fully in Neutral until it is running  
smoothly. If the outboard is mounted  
on a boat, be sure the boat is tightly  
moored.  
2) Adjust the throttle stop-screw 1 to  
set the idling speed to specification  
(see “SPECIFICATIONS” on page 4-1)  
by turning the stop-screw clockwise  
to increase the idling speed, and turn-  
ing it counterclockwise to decrease  
the idling speed.  
q
204051  
NOTE:  
Correct idling-speed adjustment is only  
possible if the engine is fully warmed-up.  
If not warmed up fully, the speed setting  
will tend to be too high. If you have diffi-  
culty obtaining the specified idle, consult  
a Yamaha dealer or other qualified  
mechanic.  
4-18  
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EMU01415  
CHANGING ENGINE OIL  
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8 Avoid draining the engine oil immedi-  
ately after stopping the engine. The oil  
is hot and should be handled with care  
to avoid burns.  
8 Be sure the outboard is securely fas-  
tened to the transom or a stable stand.  
cC  
8 Change the engine oil after the first 10  
hours of operation, and every 100 hours  
or at 6-month intervals thereafter.  
Otherwise, the engine will wear quick-  
ly.  
8 Do not overfill the oil, and be sure the  
engine is in an upright position (not tilt-  
ed) when checking and changing the  
engine oil.  
8 If the oil level is above the upper level  
mark, drain until the level meets the  
specified capacity. Overfilling the oil  
may cause leakage or damage.  
1) Put the outboard motor in an upright  
position (not tilted).  
2) Prepare a suitable container which  
can hold a larger amount than the  
engine oil capacity. Loosen and  
remove the drain bolt 1 while hold-  
ing the container under the drain  
hole. Let the oil drain completely.  
Wipe up any spilled oil immediately.  
3) Put a new gasket on the drain bolt.  
Apply a light coat of oil to the gasket  
and reinstall the drain bolt.  
000912  
q
Tightening torque:  
601025  
Refer to “SPECIFICATIONS”, page 4-1.  
4-19  
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NOTE:  
If a torque wrench is not available when  
you are installing the drain plug, finger  
tighten the bolt just until the gasket  
comes into contact with the surface of the  
drain hole. Then tighten 1/4 - 1/2 turn.  
Have the drain plug torqued to the correct  
value with a torque wrench as soon as  
possible.  
4) Remove the oil filler cap 2. Add the  
correct amount of oil through the  
filler hole.  
w
Reinstall the filler cap.  
Engine oil grade/capacity:  
Refer to “SPECIFICATIONS”, page 4-1.  
5) Start the engine and watch to make  
sure the low oil pressure warning  
lamp turns off. Make sure that there  
are no oil leaks.  
203025  
cC  
If the oil lamp does not turn off, or if  
there are oil leaks, stop the engine and  
find the cause. Continued operation with  
a problem could cause severe engine  
damage. If the problem cannot be found  
and corrected, consult your Yamaha deal-  
er.  
6) Turn off the engine and wait 3 min-  
utes. Recheck the oil level using the  
dipstick to be sure the level falls  
between the upper and lower marks.  
Fill with oil if it is below the lower  
mark, or drain to the specified level if  
it is above the upper mark.  
7) Dispose of used oil according to local  
regulations.  
201012  
4-20  
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NOTE:  
8 For disposal of used oil consult your  
Yamaha dealer.  
8 The oil should be changed more often  
when the engine is operated under  
adverse conditions such as extended  
trolling.  
EMU00380*  
CHECKING TIMING BELT  
Inspect the timing-belt and replace it if  
any of the following signs is observed:  
8 Cracks in the back of the belt or in the  
base of belt teeth.  
8 Excessive wear at the roots of cogs.  
8 Rubber portion swollen by oil.  
8 Belt surfaces roughened.  
206013  
8 Signs of wear on edges or outer surface  
of belt.  
8 Stretching by 10 mm (0.39 in) or more  
when the belt is pushed with a finger.  
cC  
Consult your Yamaha dealer when replac-  
ing the timing-belt.  
4-21  
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EMU01329  
REPLACING FUSE  
If the fuse has blown on an Electric start  
model, open the fuse holder and replace  
the fuse with a new one of proper amper-  
age.  
w
w
Be sure to use the specified fuse. An  
incorrect fuse or a piece of wire may  
allow excessive current flow. This could  
cause electrical system damage and a fire  
hazard.  
205044  
q
NOTE:  
If the new fuse blows again immediately,  
consult a Yamaha dealer.  
1 Fuse holder  
2 Fuse (20A)  
EMU00383  
CHECKING WIRING AND  
CONNECTORS  
1) Check that each grounding wire is  
properly secured.  
2) Check that each connector is engaged  
securely.  
EMU00384  
413014  
EXHAUST LEAKAGE  
Start the engine and check that no  
exhaust leaks from the joints between the  
exhaust cover, cylinder head and crank  
case.  
EMU00385  
WATER LEAKAGE  
Start the engine and check that no water  
leaks from the joints between the exhaust  
cover, cylinder head and crank case.  
4-22  
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EMU00992  
CHECKING POWER TRIM AND TILT  
SYSTEM  
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8 Never get under the lower unit while it  
is tilted, even when the tilt-support  
lever is locked. Severe injury could  
occur if the outboard accidentally falls.  
8 Make sure no one is under the out-  
board before performing this test.  
1) Check the power trim and tilt unit for  
any sign of oil leaks.  
q
2) Operate each of the power trim and  
tilt switches on remote control and  
engine bottom cowling (If equipped)  
to check that all switches work.  
3) Tilt up the motor and check that the  
trim and tilt rod 1 is pushed out com-  
pletely.  
411034  
4) Check that the trim and tilt rod is free  
of corrosion or other flaws.  
5) Operate the motor to trim and tilt  
down. Check that the trim and tilt rod  
operates smoothly.  
NOTE:  
If any operation is abnormal, consult a  
Yamaha dealer.  
Recommended fluid;  
Yamaha power trim & tilt fluid or ATF  
(DEXRON-II)  
4-23  
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EMU00388  
CHECKING PROPELLER  
w
You could be seriously injured if the  
engine accidentally starts while you are  
near the propeller.  
8 Before inspecting, removing or  
installing the propeller, remove the  
spark plug caps from the spark plugs.  
Also, put the shift control in Neutral,  
put the main switch in the “OFF” posi-  
tion and remove the key, and remove  
the lanyard from the engine stop  
switch. Turn off the battery cut-off  
switch if your boat has one.  
210011  
8 Do not use your hand to hold the pro-  
peller when loosening or tightening the  
propeller nut. Put a wood block  
between the cavitation plate and the  
propeller to prevent the propeller from  
turning.  
602051  
EMU00390  
Propeller Checking Point  
8 Check each of the propeller blades for  
wear, erosion from cavitation or ventila-  
tion, or other damage.  
8 Check the splines for wear and damage.  
8 Check for fish line winding around the  
propeller shaft.  
602054  
8 Check the propeller shaft oil seal for  
damage.  
4-24  
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EMU00976  
Removing the Propeller  
1
1) Straighten the cotter-pin 1 and pull it  
out using a pair of pliers.  
2) Remove the propeller nut 2, washer  
3 and spacer 4.  
3) Remove the propeller 5 and thrust  
washer 6  
2
3
4
5
6
602045*  
FT25  
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y
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r
602073  
t
EMU00397  
Installing the Propeller  
cC  
8 Be sure to install the thrust washer  
before installing propeller, otherwise,  
lower case and propeller boss may be  
damaged.  
8 Be sure to use a new cotter pin and  
bend the ends over securely.  
Otherwise, the propeller could come off  
during operation and be lost.  
1) Apply Yamaha Marine grease or  
Corrosion resistant grease to the pro-  
peller-shaft.  
2) Install the thrust washer and propeller  
on the propeller-shaft.  
3) Install the spacer and washer. Tighten  
the propeller nut to the specified  
torque.  
4-25  
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Tightening torque:  
Refer to “SPECIFICATIONS” page 4-1.  
4) Align the propeller nut with the pro-  
peller shaft hole. Insert a new cotter  
pin in the hole and bend the cotter pin  
ends.  
NOTE:  
602053  
If the propeller nut does not align with the  
propeller shaft hole after tightening to the  
specified torque, then tighten the nut fur-  
ther to align it with the hole.  
EMU01460  
CHANGING GEAR OIL  
w
8 Be sure the outboard is securely fas-  
tened to the transom or a stable stand.  
You could be severely injured if the out-  
board falls on you.  
8 Never get under the lower unit while it  
is tilted, even when the tilt-support  
lever/knob is locked. Severe injury  
could occur if the outboard accidentally  
falls.  
1) Tilt the outboard motor so that the oil  
drain plug is at the lowest point possi-  
ble.  
2) Place a suitable container under the  
gear-case.  
4-26  
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3) Remove the oil drain plug 1.  
NOTE:  
The oil drain plug is magnetic. Remove all  
metal particles from the plug before rein-  
stalling it.  
w
4) Remove the oil level plug 2 to allow  
the oil to drain completely.  
q
cC  
000650  
Inspect the used oil after it has been  
drained. If the oil is milky, water is get-  
ting into the gear-case which can cause  
gear damage. Consult a Yamaha dealer  
for repair of the lower unit seals.  
NOTE:  
For disposal of used oil consult your  
Yamaha dealer.  
5) With the outboard motor in a vertical  
position, and using a flexible or pres-  
surized filling device, inject the gear  
oil into the oil drain plug hole.  
Gear oil grade/capacity:  
Refer to “SPECIFICATIONS,” page 4-1.  
6) When the oil begins to flow out of the  
oil level plug hole, insert and tighten  
the oil level plug.  
601022  
7) Insert and tighten the oil drain plug.  
4-27  
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EMU00401  
CLEANING FUEL TANK  
w
Gasoline (petrol) is highly flammable, and  
its vapors are flammable and explosive.  
8 If you have any question about properly  
doing this procedure, consult your  
Yamaha dealer.  
8 Keep away from sparks, cigarettes,  
flames or other sources of ignition  
when cleaning the fuel tank.  
8 Remove the fuel tank from the boat  
before cleaning it. Work only outdoors  
in an area with good ventilation.  
8 Wipe up any spilled fuel immediately.  
8 Reassemble the fuel tank carefully.  
Improper assembly can result in a fuel  
leak, which could result in a fire or  
explosion hazard.  
8 Dispose of old gasoline (petrol)accord-  
ing to local regulations.  
1) Empty the fuel tank into an approved  
gasoline (petrol) container.  
2) Pour a small amount of suitable sol-  
vent in the tank. Reinstall the cap and  
shake the tank. Drain the solvent  
completely.  
EMU00402  
Cleaning the Fuel Filter  
1) Remove the screws holding the fuel  
hose joint assembly . Pull the assem-  
bly out of the tank.  
2) Clean the filter (located on the end of  
the suction pipe) in a suitable clean-  
ing solvent. Allow the filter to dry.  
3) Replace the gasket with a new one.  
Reinstall the fuel hose joint assembly  
and tighten the screws firmly.  
902054  
4-28  
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EMU00831  
INSPECTING AND REPLACING  
ANODE(S)  
Yamaha outboard motor is protected  
from corrosion by a sacrificial anode(s).  
Check the anode(s) periodically. Remove  
the scales from surfaces of the anode(s).  
For the inspection and replacement of the  
anode(s), consult a Yamaha dealer.  
604024  
405014  
cC  
Do not paint the anode(s), for this would  
render it ineffective  
T25  
604016  
405015  
4-29  
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EMU00404  
CHECKING BATTERY  
(for Electric start model)  
w
Battery electrolytic fluid is dangerous; it  
contains sulfuric acid and therefore is poi-  
sonous and highly caustic.  
Always follow these preventive mea-  
sures:  
8 Avoid bodily contact with electrolytic  
fluid as it can cause severe burns or  
permanent eye injury.  
8 Wear protective eye gear when han-  
dling or working near batteries.  
Antidote (EXTERNAL):  
8 SKIN - Flush with water.  
8 EYES - Flush with water for 15 minutes  
and get immediate medical attention.  
Antidote (INTERNAL):  
8 Drink large quantities of water or milk  
followed by milk of magnesia, beaten  
egg, or vegetable oil. Get immediate  
medical attention.  
Batteries also generate explosive  
hydrogen gas; therefore, you should  
always follow these preventive mea-  
sures:  
8 Charge batteries in a well-ventilated  
area.  
8 Keep batteries away from fire, sparks,  
or open flames (e.g., welding equip-  
ment, lighted cigarettes, etc.).  
8 DO NOT SMOKE when charging or han-  
dling batteries.  
8 KEEP BATTERIES AND ELECTROLYTIC  
FLUID OUT OF REACH OF CHILDREN.  
4-30  
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cC  
8 A poorly maintained battery will quick-  
ly deteriorate.  
8 Ordinary tap-water contains minerals  
harmful to a battery, and should not be  
used for topping-up.  
UPPER LEVEL  
LOWER LEVEL  
1) Check the electrolyte level at least  
once a month. Fill to the manufactur-  
er’s recommended level when neces-  
sary. Top up only with distilled water  
(or pure de-ionized water suitable to  
use in batteries).  
901015  
2) Keep the battery always in a good  
state of charge. Installing a voltmeter  
will help you monitor your battery. If  
you will not use the boat for a month  
or more, remove the battery from the  
boat and store it in a cool, dark place.  
Completely recharge the battery  
before using it.  
3) If the battery will be stored for longer  
than a month, check the specific grav-  
ity of the fluid at least once a month  
and recharge the battery when it is  
low.  
EMU01279  
Connecting the Battery  
w
Mount the battery holder securely in a  
dry, well-ventilated, vibration-free loca-  
tion in the boat. Install a fully charged  
battery in the holder.  
4-31  
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cC  
8 Make sure the main switch (on applica-  
ble models) is “OFF” before working on  
the battery.  
q
8 Reversal of the battery leads will dam-  
age the rectifier.  
w
UPPER LEVEL  
LOWER LEVEL  
8 Connect the RED lead first when  
installing the battery and disconnect  
the RED lead last when removing it.  
Otherwise, the electrical system can be  
damaged.  
e
901012  
8 The electrical contacts of the battery  
and cables must be clean and properly  
connected, or the battery will not start  
the engine.  
Connect the RED lead to the POSITIVE (+)  
terminal first.  
Then connect the BLACK lead to the NEG-  
ATIVE (-) terminal.  
1 Red lead  
2 Black lead  
3 Battery  
EMU01280  
Disconnecting the Battery  
Disconnect the BLACK lead from the NEG-  
ATIVE (-) terminal first. Then disconnect  
the RED lead from the POSITIVE (+) termi-  
nal.  
EMU00408  
CHECKING BOLTS AND NUTS  
1) Check that bolts securing the cylinder  
head and engine and the nut securing  
the flywheel are tightened with their  
specified tightening torque.  
2) Check the tightening torque of other  
bolts and nuts.  
4-32  
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EMU01172  
CLEANING COOLING-WATER  
PASSAGES  
Flushing device equipped model  
Perform this procedure right after opera-  
tion for the most thorough flushing.  
1) After shutting off the engine, unscrew  
the garden-hose connector 2 from  
the fitting 1 on the bottom cowling.  
2) Screw the garden-hose connector 2  
onto a garden hose 3 which is con-  
nected to a fresh-water supply.  
3) With the engine off, turn on the water  
tap and let the water flush through  
the cooling passages for about 15  
minutes. Turn off the water and dis-  
connect the garden hose 3.  
4) When flushing is complete, reinstall  
the garden-hose connector 2 on the  
fitting 1 on the bottom cowling.  
Tighten the connector securely.  
q
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cC  
Do not leave the garden-hose connector  
loose on the bottom cowling fitting or let  
the hose hang free during normal opera-  
tion. Water will leak out of the connector  
instead of cooling the engine, which can  
cause serious overheating. Be sure the  
connector is tightened securely on the fit-  
ting after flushing the engine.  
000913  
NOTE:  
8 When flushing the engine with the boat  
in the water, tilting up the engine until it  
is completely out of the water will  
achieve better results.  
8 Refer to cooling system flushing  
instructions in “TRANSPORTING AND  
STORING OUTBOARD MOTOR”.  
4-33  
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EMU00409  
MOTOR EXTERIOR  
EMU00410  
Cleaning the Outboard Motor  
After use, wash the exterior of the out-  
board with fresh water.  
Flush the cooling system with fresh  
water.  
NOTE:  
001187  
Refer to Flushing Cooling System instruc-  
tions in “TRANSPORTING AND STORING  
OUTBOARD MOTOR”.  
EMU00412  
Checking Painted Surface of Motor  
Check the motor for scratches, nicks, or  
flaking paint. Areas with damaged paint  
are more likely to corrode. If necessary,  
clean and paint the areas. A touch-up  
paint is available from a Yamaha dealer.  
EMU00413  
COATING THE BOAT BOTTOM  
A clean hull improves boat performance.  
The boat bottom should be kept as clean  
of marine growths as possible. If neces-  
sary, the boat bottom can be coated with  
an anti-fouling paint approved for your  
area to inhibit marine growth.  
Do not use anti-fouling paint which  
includes copper or graphite. These paints  
can cause more rapid engine corrosion.  
102025  
4-34  
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-MEMO-  
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EMU00414  
Chapter 5  
1
2
3
4
5
6
TROUBLE RECOVERY  
TROUBLESHOOTING ..............................5-1  
TEMPORARY ACTION IN  
EMERGENCY............................................5-5  
Impact damage.....................................5-5  
Power trim/tilt will not operate ...........5-5  
Starter will not operate........................5-6  
Treatment of submerged motor.........5-9  
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EMU01204¯  
TROUBLESHOOTING  
A problem in the fuel, compression, or ignition systems can cause poor starting, loss of  
power, or other problems. The troubleshooting chart describes basic checks and possi-  
ble remedies. (This chart covers all Yamaha outboard motors. Therefore, some items  
may not apply to your model.)  
If your outboard motor requires repair, bring it to a Yamaha dealer.  
Trouble  
Possible Cause  
Remedy  
1. Battery capacity weak or low.  
1. Check battery condition. Use  
battery of recommended capacity.  
2. Tighten battery cables and clean  
battery terminals.  
2. Battery connections loose or  
corroded.  
A. Starter will not  
operate.  
3. Fuse for electric start circuit blown.  
3. Check for cause of electric  
overload and repair. Replace fuse  
with one of correct amperage.  
4. Have serviced by a Yamaha  
dealer.  
4. Starter components faulty.  
5. Shift lever in gear.  
5. Shift to neutral.  
1. Fuel tank empty.  
2. Fuel contaminated or stale.  
3. Fuel filter clogged.  
1. Fill tank with clean, fresh fuel.  
2. Fill tank with clean, fresh fuel.  
3. Clean or replace filter.  
4. Read "STARTING ENGINE"  
section.  
4. Starting procedure incorrect.  
5. Fuel pump malfunctions.  
5. Have serviced by a Yamaha  
dealer.  
6. Spark plug(s) fouled or incorrect  
type.  
7. Spark plug cap(s) fitted incorrectly.  
8. Poor connections or damaged  
ignition wiring.  
6. Inspect spark plug(s). Clean or  
replace with recommended type.  
7. Check and re-fit cap(s).  
8. Check wires for wear or breaks.  
Tighten all loose connections.  
Replace worn or broken wires.  
9. Have serviced by a Yamaha  
dealer.  
B. Engine will not  
start (Starter  
operates).  
9. Ignition parts faulty.  
10. Engine stop switch lanyard not  
attached.  
10. Attach lanyard.  
11. Engine inner parts damaged.  
11. Have serviced by a Yamaha  
dealer.  
5-1  
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Trouble  
Possible Cause  
Remedy  
1. Spark plug(s) fouled or incorrect  
type.  
2. Fuel system obstructed.  
1. Inspect spark plug(s). Clean or  
replace with recommended type.  
2. Check for pinched or kinked fuel  
line or other obstructions in fuel  
system.  
3. Fuel contaminated or stale.  
4. Fuel filter clogged.  
5. Failed ignition parts.  
3. Fill tank with clean, fresh fuel.  
4. Clean or replace filter.  
5. Have serviced by a Yamaha  
dealer.  
6. Warning system activated.  
7. Spark plug gap incorrect.  
8. Poor connections or damaged  
ignition wiring.  
6. Find and correct cause of warning.  
7. Inspect and adjust as specified.  
8. Check wires for wear or breaks.  
Tighten all loose connections.  
Replace worn or broken wires.  
9. Check and replace oil as specified.  
10. Have serviced by a Yamaha  
dealer.  
9. Specified engine oil not used.  
10. Thermostat faulty or clogged.  
C. Engine idles  
irregularly or stalls.  
11. Carburetor adjustments incorrect.  
12. Fuel pump damaged.  
11. Have serviced by a Yamaha  
dealer.  
12. Have serviced by a Yamaha  
dealer.  
13. Air vent screw on the fuel tank  
closed.  
13. Open the air vent screw.  
14. Motor angle too high.  
14. Return to normal operating  
position.  
15. Carburetor clogged.  
15. Have serviced by a Yamaha  
dealer.  
16. Fuel joint connection incorrect.  
17. Throttle valve adjustment incorrect.  
15. Connect correctly.  
17. Have serviced by a Yamaha  
dealer.  
18. Battery lead disconnected.  
18. Connect securely.  
5-2  
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E
Trouble  
Possible Cause  
Remedy  
1. Cooling system clogged.  
2. Engine oil level low.  
1. Check water intake for restriction.  
2. Fill oil tank with specified engine  
oil.  
3. Heat range of spark plug incorrect.  
4. Specified engine oil not used.  
3. Inspect spark plug and replace it  
with recommended type.  
4. Check and replace oil with  
specified type.  
D. Warning buzzer  
sounds or  
5. Engine oil contaminated or  
deteriorated.  
6. Oil filter clogged.  
5. Replace oil with fresh, specified  
type.  
6. Have serviced by a Yamaha  
dealer.  
indicator lamp  
lights.  
7. Oil feed/injection pump  
malfunctions.  
7. Have serviced by a Yamaha  
dealer.  
8. Load on boat improperly distributed.  
8. Distribute load to place boat on an  
even plane.  
9. Water pump/thermostat faulty.  
9. Have serviced by a Yamaha  
dealer.  
1. Propeller damaged.  
1. Have propeller repaired or  
replaced.  
2. Propeller pitch or diameter incorrect.  
2. Install correct propeller to operate  
outboard at its recommended  
speed (r/min) range.  
3. Trim angle incorrect.  
3. Adjust trim angle to achieve most  
efficient operation.  
4. Motor mounted at incorrect height  
on transom.  
4. Have motor adjusted to proper  
transom height.  
5. Warning system activated.  
6. Boat bottom fouled with marine  
growth.  
5. Find and correct cause of warning.  
6. Clean boat bottom.  
E. Engine power loss.  
7. Spark plug(s) fouled or incorrect  
type.  
8. Weeds or other foreign matter  
tangled on gear housing.  
9. Fuel system obstructed.  
7. Inspect spark plug(s). Clean or  
replace with recommended type.  
8. Remove foreign matter and clean  
lower unit.  
9. Check for pinched or kinked fuel  
line or other obstructions in fuel  
system.  
10. Fuel filter clogged.  
11. Fuel contaminated or stale.  
12. Spark plug gap incorrect.  
10. Clean or replace filter.  
11. Fill tank with clean, fresh fuel.  
12. Inspect and adjust as specified.  
5-3  
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Trouble  
Possible Cause  
Remedy  
13. Poor connections or damaged  
ignition wiring.  
13. Check wires for wear or breaks.  
Tighten all loose connections.  
Replace worn or broken wires.  
14. Have serviced by a Yamaha  
dealer.  
14. Failed ignition parts.  
15. Specified engine oil not used.  
15. Check and replace oil with  
specified type.  
E. Engine power loss. 16. Thermostat faulty or clogged.  
16. Have serviced by a Yamaha  
dealer.  
17. Air vent screw closed.  
18. Fuel pump damaged.  
17. Open the air vent screw.  
18. Have serviced by a Yamaha  
dealer.  
19. Fuel joint connection incorrect.  
19. Connect correctly.  
20. Heat range of spark plug incorrect.  
20. Inspect spark plug and replace it  
with recommended type.  
1. Propeller damaged.  
1. Have propeller repaired or  
replaced.  
2. Propeller shaft damaged.  
2. Have serviced by a Yamaha  
dealer.  
F. Engine vibrates  
3. Weeds or other foreign matter  
excessively.  
3. Remove and clean propeller.  
tangled on propeller.  
4. Motor mounting bolt loose.  
4. Tighten bolt.  
5. Steering pivot loose or damaged.  
5. Tighten or have serviced by a  
Yamaha dealer.  
5-4  
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EMU00416  
TEMPORARY ACTION IN  
EMERGENCY  
EMU01492  
IMPACT DAMAGE  
w
The outboard motor can be seriously  
damaged by a collision while operating  
or trailering. Damage could make the out-  
board motor unsafe to operate.  
If the outboard motor hits any object in  
the water, follow the procedure below.  
1) Stop the engine immediately.  
2) Inspect the control system and all  
components for damage. Also,  
inspect the boat for damage.  
607011  
3) Whether damage is found or not,  
return to the nearest harbor slowly  
and carefully.  
4) Have a Yamaha dealer inspect the  
outboard motor before operating it  
again.  
EMU00419  
POWER TRIM/TILT WILL NOT  
OPERATE  
If the engine cannot be tilted up or down  
with the power trim and tilt because of a  
discharged battery or a failure with the  
power trim and tilt unit, the engine can be  
tilted manually.  
1 Manual valve screw  
EMU00420  
1) Loosen the manual valve screw clock-  
wise until it stops.  
2) Put the engine in the desired position,  
then tighten the manual valve screw  
counterclockwise.  
q
411033  
5-5  
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EMU00423  
STARTER WILL NOT OPERATE  
If the starter mechanism does not operate  
(engine cannot be cranked with the  
starter), the engine can be started with an  
emergency starter rope.  
w
8 Use this procedure only in an emer-  
gency and only to return to port for  
repairs.  
8 When the emergency starter rope is  
used to start the engine, the start-in-  
gear protection device does not oper-  
ate. Make sure the gear shift lever/  
remote control lever is in neutral.  
Otherwise, the boat could unexpected-  
ly start to move, which could result in  
an accident.  
8 Be sure no one is standing behind you  
when pulling the starter rope. It could  
whip behind you and injure someone.  
8 An unguarded rotating flywheel is very  
dangerous. Keep loose clothing and  
other objects away when starting the  
engine. Use the emergency starter rope  
only as instructed. Do not touch the fly-  
wheel or other moving parts when the  
engine is running. Do not install the  
starter mechanism or top cowling after  
the engine is running.  
8 Do not touch the ignition coil, high  
voltage wire, spark plug cap or other  
electrical components when starting of  
operating the motor. You could be  
shocked.  
5-6  
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EMU00961¯  
Emergency Starting Engine  
1) Remove the top cowling.  
e
w
2) Remove the start-in-gear protection  
cable 1 from the starter after remov-  
ing the clip 2 and the screw 3 if the  
cable is equipped.  
q
3) Remove the starter/flywheel cover  
after removing 4 bolts.  
Disconnect the leads for the warning  
indicator.  
208061  
208062  
4) Prepare the engine for starting. See  
“STARTING ENGINE” for procedures.  
Be sure the engine is in Neutral and  
that the lock-plate on the end of lan-  
yard is attached to the engine stop  
lanyard switch. Set the main switch to  
“ON” if equipped.  
ON  
OFF  
START  
506021***  
5-7  
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5) Insert the knotted end of the emer-  
gency starter rope into the notch in  
the flywheel rotor and wind the rope  
several turns clockwise.  
6) Pull the rope slowly until resistance is  
felt.  
7) Give a strong pull straight out to  
crank and start the engine. Repeat if  
necessary.  
208063  
5-8  
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EMU00446  
TREATMENT OF SUBMERGED  
MOTOR  
If the outboard motor is submerged,  
immediately take it a Yamaha dealer.  
Otherwise, some corrosion may begin  
almost immediately.  
If you cannot immediately take the out-  
board motor to a Yamaha dealer, follow  
the procedure bellow for taking care to  
minimize engine damage.  
EMU00448  
1) Thoroughly wash away mud, salt,  
seaweed, etc. with fresh water.  
2) Remove the spark plug(s), then face  
the spark plug holes downward to  
allow any water, mud or contami-  
nants to drain.  
3) Drain the fuel from the carburetor,  
fuel filter and fuel line. Drain the  
engine oil completely.  
4) Fill the sump with the fresh engine oil  
as the same quantity as the engine oil  
capacity.  
Engine oil capacity: Refer to SPECIFI-  
CATIONS, Page 4-1.  
5) Feed engine fogging oil or engine oil  
through the carburetor(s) and spark  
plug hole(s) while cranking the  
engine with the manual starter or  
emergency starter rope.  
6) Take the outboard motor to a Yamaha  
dealer as soon as possible.  
cC  
Do not attempt to run the motor until it  
has been completely inspected.  
5-9  
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EMU00450  
Chapter 6  
INDEX  
1
2
3
4
5
6
INDEX........................................................6-1  
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E
EMU00451  
E
INDEX  
Emission control information.................1-2  
Emergency starting engine.....................5-7  
A
Adjusting idling speed ..........................4-18 Engine oil................................................1-13  
Adjusting trim angle..............................3-19 Engine stop button ..................................2-5  
Air vent screw...........................................2-2 Engine stop lanyard switch ..............2-5,2-8  
B
Exhaust leakage .....................................4-22  
Basic boating rules ..................................1-7  
F
Battery care...............................................4-9 Filling fuel .................................................3-8  
Battery requirement ..............................1-14 Filling fuel tank.........................................4-5  
Bow down...............................................3-21 Flushing cooling system and fogging  
Bow up....................................................3-21 engine........................................................4-6  
Breaking in (running in) engine..............3-5 Flushing device ......................................2-18  
C
Forward...................................................3-15  
Changing engine oil ..............................4-19 Fuel hose joint..........................................2-2  
Changing gear oil...................................4-26 Fuel meter.................................................2-2  
Checking battery ....................................4-30 Fuel tank....................................................2-2  
Checking bolts and nuts........................4-32 Fuel tank cap.............................................2-2  
Checking fuel system ............................4-16 Fueling instructions ...............................1-11  
Checking painted surface of motor......4-34  
G
Checking power trim and tilt system...4-23 Gasoline..................................................1-12  
Checking propeller.................................4-24 Gasohol...................................................1-12  
Checking the engine oil level..................3-7 Gear shift lever.........................................2-3  
Checking timing belt..............................4-21 Greasing..................................................4-12  
Checking wiring and connectors..........4-22  
Clamping the outboard motor................3-4 Hour meter..............................................2-15  
Cleaning and adjusting spark plug ......4-14  
H
I
Cleaning and anti-corrosion measure ...4-8 Identification numbers record................1-1  
Cleaning cooling-water passages........4-33 Impact damage ........................................5-5  
Cleaning fuel tank ..................................4-28 Important labels.......................................1-6  
Cleaning the fuel filter ...........................4-28 Inspecting and replacing anode...........4-29  
Cleaning the outboard motor...............4-34 Inspecting fuel filter...............................4-17  
Coating the boat bottom.......................4-34 Installation ................................................3-1  
Connecting the battery..........................4-31 Installing the propeller ..........................4-25  
Cruising in other conditions .................3-27  
Cruising in salt water.............................3-27 Key number..............................................1-1  
Cruising in shallow water .....................3-25  
Crusing in turbid water .........................3-27 Low oil pressure warning .....................2-20  
Low oil pressure warning indicator.....2-16  
K
L
D
Digital tachometer .................................2-14 Lubrication................................................4-8  
Disconnecting the battery.....................4-32  
6-1  
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M
Stopping engine.....................................3-17  
Main components....................................2-1 Storing outboard motor..........................4-5  
Main switch ..............................................2-7  
T
Maintenance chart.................................4-11 Tachometer ............................................2-14  
Motor exterior ........................................4-34 Temporary action in emergency............5-5  
Mounting height ......................................3-3 Throttle control grip.................................2-4  
Mounting the outboard motor ...............3-2 Throttle friction adjusting knob..............2-4  
N
Throttle friction adjusting screw ...........2-9  
Neutral interlock trigger..........................2-6 Throttle indicator .....................................2-4  
Neutral throttle lever ...............................2-7 Tiller handle..............................................2-3  
O
Tilt lock mechanism...............................2-17  
Tilt support bar.......................................2-17  
Operations of controls and other  
functions ...................................................2-2 Tilt support knob....................................2-17  
Outboard motor serial number ..............1-1 Tilting up/down......................................3-22  
Overheat warning..................................2-19 Top cowling lock lever ..........................2-17  
Overheat warning indicator..................2-16 Trailering outboard motor ......................4-4  
P
Transporting and storing outboard  
Periodic maintenance............................4-10 motor.........................................................4-4  
Power trim/tilt switch ......................2-9,2-13 Treatment of submerged motor ............5-9  
Power trim/tilt will not operate...............5-5 Trim angle adjusting rod.......................2-13  
Pre-operation checks...............................3-6 Trim meter..............................................2-15  
Propeller selection .................................1-15 Trim tab...................................................2-11  
R
Trimming outboard motor....................3-18  
Recoil starter handle................................2-3 Troubleshooting.......................................5-1  
Remote control.........................................2-6  
W
Remote control lever...............................2-6 Warming up engine...............................3-14  
Removing the propeller ........................4-25 Warning indicator(s)..............................2-14  
Replacement parts.................................4-10 Warning system.....................................2-19  
Replacing fuse........................................4-22 Water leakage.........................................4-22  
Reverse ...................................................3-16 Warranty Information .................Next page  
Ring free fuel additive .............................3-8  
S
Safety information...................................1-4  
Shifting....................................................3-15  
Specifications ...........................................4-1  
Star labels.................................................1-3  
Start-in-gear protection.........................1-16  
Starter button ...........................................2-3  
Starter will not operate............................5-6  
Starting engine.........................................3-9  
Steering friction adjusting lever...........2-10  
6-2  
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EMU01599  
IMPORTANT WARRANTY INFORMATION FOR U.S.A. AND  
CANADA  
Welcome to the Yamaha Family!  
Congratulations on the purchase of your new Yamaha marine power. Yamaha is commit-  
ted to exceptional customer satisfaction, and we want your ownership experience to be  
a satisfying one. Please read the following warranty information to help ensure satisfac-  
tion with your Yamaha.  
Yamaha is ready to stand behind your purchase with strong warranty coverage. To be sure  
you receive all the benefits of warranty, please take the following steps:  
1. Be sure your new Yamaha is registered for warranty. Your boat dealer should do this at  
the time of sale. Make sure your dealer gives you a copy of the completed Yamaha regis-  
tration card for your records. If you are unsure whether or not your Yamaha is registered,  
complete the Warranty Registration card found inside the cover of the Owner's Manual.  
Mail it to the distributor for the country in which you live (see step 6 for the correct  
address). If your Yamaha is not properly registered, a warranty repair could be unneces-  
sarily delayed while registration records are checked.  
2. Read the Limited Warranty statement which follows these instructions. This warranty  
applies to Yamaha outboard motors sold in the United States, whether purchased sepa-  
rately or when supplied as original equipment by a boat builder. The terms also apply to  
original equipment packages sold in Canada, with coverage provided by Yamaha Motor  
Canada (see ``Warranty Guide'' for Canadian models). This warranty explains the condi-  
tions of the warranty, including the obligations that your dealer and you as the owner  
have under the warranty. For example, your Yamaha outboard must receive a proper  
pre-delivery inspection (PDI) by the selling dealer. Failure to take this important step  
could jeopardize warranty coverage!  
3. If you need warranty repairs, you must take your Yamaha outboard to an authorized  
Yamaha outboard dealer. Be aware that not all selling boat dealers are authorized  
Yamaha dealers. Only authorized dealers have the factory training, special tools, and  
Yamaha support needed to perform warranty repairs.  
4. If you are away from home, or your selling dealer is not an authorized Yamaha dealer,  
use the following toll-free numbers to find the nearest Yamaha dealer.  
United States Dealer Locations: 1-800-692-6242  
Canada Dealer Locations:  
1-800-267-8577  
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5. Your warranty applies specifically to repairs made in the country of purchase. If your  
U.S.-purchased Yamaha needs warranty service while in Canada, or your Canadian pur-  
chased Yamaha needs service while in the United States, Yamaha will assist the local  
dealer whenever possible. However, some products available in one country may not be  
sold or serviced in the other.  
6. If you need any additional information about your Yamaha or warranty coverage which  
your dealer cannot provide, please contact us directly.  
Yamaha Motor Corporation, U.S.A.  
P.O. Box 6555  
Cypress, CA 90630  
Attention: Customer Relations Department  
Telephone No.  
Fax No.  
(714) 761-7439  
(714) 761-7559  
Yamaha Motor Canada Ltd.  
480 Gordon Baker Road  
Toronto, Ontario  
M2H 3B4  
Attention: Customer Relations Department  
Telephone No.  
Fax No.  
(416) 498-1911  
(416) 491-3122  
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EMU01404  
YAMAHA MOTOR CORPORATION, U.S.A.  
FOUR-STROKE OUTBOARD MOTOR  
THREE-YEAR LIMITED WARRANTY  
Yamaha Motor Corporation, U.S.A. hereby warrants that new Yamaha 1999-or-later model four-stroke outboard motors originally dis-  
tributed by Yamaha Motor Corporation, U.S.A. will be free from defects in material and workmanship for the period of time stated here-  
in, subject to certain stated limitations. Warranty coverage for outboards distributed by non-US Yamaha affiliated companies may be  
different.  
PERIOD OF WARRANTY. Any new Yamaha 1999-or-later model four-stroke outboard motor purchased and registered with Yamaha  
Motor Corporation, U.S.A. for pleasure use in the United States, will be warranted against defects in material or workmanship for a peri-  
od of three (3) years from the date of purchase, subject to exclusions noted herein. Any Yamaha outboard motor purchased and utilized  
for commercial applications will be warranted for a period of one (1) year from the date of purchase, subject to exclusions noted herein.  
Yamaha peripheral equipment included with the motor, such as gauges, fuel tanks, and hoses, remote control boxes, and wiring exter-  
nal from the motor unit, will be warranted for one (1) year from the date of purchase of either pleasure or commercial use. Replacement  
parts used in warranty repairs will be warranted for the balance of the applicable warranty period.  
The second and third year of warranty (if applicable) shall be limited to covering the cost of parts and labor for major components only.  
The major components covered are:  
Power Unit Section  
8 Power Head  
8 Intake Manifold  
8 Carburetor Assembly and its Related Components  
8 Fuel Injection System and its Related Components  
8 Fuel and Oil Pump Assemblies  
8 Ignition System (Standard and Microcomputer)  
Lower Unit Section  
8 Exhaust System  
8 Upper Casing  
8 Lower Unit Assembly  
Bracket Section  
8 Bracket System  
8 Power Trim and Tilt Assembly  
WARRANTY REGISTRATION. To be eligible for warranty coverage, the outboard motor must be registered with Yamaha Motor  
Corporation, U.S.A. Warranty registration can be accomplished by any authorized Yamaha Outboard Motor Dealer. Upon receipt of the  
registration, an Owner’s Warranty Card will be sent by Yamaha to the registered purchaser.  
OBTAINING REPAIRS UNDER WARRANTY. To receive repairs under this warranty, a valid Owner’s Warranty Card must be presented to  
an authorized Yamaha Outboard Motor Dealer.  
During the period of warranty, any authorized Yamaha outboard dealer will, free of charge, repair or replace, at Yamaha’s option, any  
parts adjudged defective by Yamaha due to faulty workmanship or material from the factory. All replaced parts will become the property  
of Yamaha Motor Corporation, U.S.A.  
CUSTOMER’S RESPONSIBILITY. Under the terms of this warranty, the customer will be responsible for ensuring that the outboard  
motor is properly operated, maintained, and stored as specified in the applicable Owner’s Manual.  
The owner of the outboard motor shall give notice to an authorized Yamaha Outboard Motor Dealer of any and all apparent defects  
within ten (10) days of discovery and make the motor available at that time for inspection and repairs at the dealer’s place of business.  
GENERAL EXCLUSIONS FROM WARRANTY. This warranty will not cover the repair of damage if the damage is a result of abuse or  
neglect of the product. Examples of abuse and neglect include, but are not limited to:  
1.  
2.  
Racing or competition use, modification of original parts, abnormal strain.  
Lack of proper maintenance and off season storage as described in the Owner’s Manual, installation of parts or accessories that are  
not equivalent in design and quality genuine Yamaha parts.  
3.  
4.  
5.  
6.  
Operation of the motor at an rpm other than specified, use of lubricants or oils that are not suitable for outboard motor use.  
Damage as a result of accidents, collisions, contact with foreign materials, or submersion.  
Growth of marine organism on motor surfaces.  
Normal deterioration.  
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SPECIFIC PARTS EXCLUDED FROM WARRANTY. Parts replaced due to normal wear or routine maintenance such as oil, spark plugs,  
shear pins, propellers, hubs, fuel and oil filters, brushes for the starter motor and power tilt motor, water pump impellers, and anodes,  
are not covered by warranty.  
Charges for removal of the motor from a boat and transporting the motor to and from an authorized Yamaha Outboard Motor Dealer are  
excluded from warranty coverage.  
Specific parts excluded from the second and third year of warranty (if applicable) are:  
8 Top and Bottom Cowling  
8 Electric Components (other than ignition system)  
8 Rubber Components (such as hoses, tubes, rubber seals,  
fittings, and clamps)  
TRANSFER OF WARRANTY. Transfer of the warranty from the original purchaser to any subsequent purchaser is possible by having the  
motor inspected by an authorized Yamaha Outboard Motor Dealer and requesting the dealer to submit a change of registration to  
Yamaha Motor Corporation, U.S.A. within ten (10) days of the transfer.  
YAMAHA MOTOR CORPORATION, U.S.A. MAKES NO OTHER WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED. ALL IMPLIED  
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE WHICH EXCEED THE OBLIGATIONS AND  
TIME LIMITS STATED IN THIS WARRANTY ARE HEREBY DISCLAIMED BY YAMAHA MOTOR CORPORATION, U.S.A. AND  
EXCLUDED FROM THIS WARRANTY.  
SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, SO THE ABOVE LIMITATIONS  
MAY NOT APPLY TO YOU. ALSO EXCLUDED FROM THIS WARRANTY ARE ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES  
INCLUDING LOSS OF USE. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUEN-  
TIAL DAMAGES, SO THE ABOVE EXCLUSION MAY NOT APPLY TO YOU.  
THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE  
TO STATE.  
YAMAHA MOTOR CORPORATION, U.S.A.  
Post Office Box 6555  
Cypress, California 90630  
WARRANTY QUESTIONS AND ANSWERS  
Q. What costs are my responsibility during the warranty period?  
A. The customer`s responsibility includes all costs of normal maintenance services, non-warranty repairs, accident and collision dam-  
ages.  
Q. What are some examples of ``abnormal’’ strain, neglect, or abuse?  
A. These terms are general and overlap each other in areas. Specific examples include:  
Running the machine out of oil, operating the machine with a broken or damaged part which causes another part to fail, damage or  
failure due to improper or careless transportation, and/or tie down. If you have any specific questions on operation or mainte-  
nance, please contact your Yamaha outboard dealer for advice.  
Q. Does the warranty cover incidental costs such as towing or transportation due to a failure?  
A. No. The warranty is limited to repair of the machine itself.  
Q. May I perform any or all of the recommended maintenance shown in the Owner’s Manual instead of having the dealer do them?  
A. Yes, if you are a qualified mechanic and follow the procedures specified in the Owner’s and Service Manuals. We do recommend,  
however, that items requiring special tools or equipment be done by a Yamaha outboard dealer.  
Q. Will the warranty be void or canceled if I do not operate or maintain my new outboard exactly as specified in the Owner’s Manual?  
A. No. The warranty on a new outboard cannot be ’’voided`` or ’’canceled``. However, if a particular failure is caused by operation or  
maintenance other than as shown in the Owner’s Manual, that failure may not be covered under warranty.  
Q. What responsibility does a Yamaha outboard dealer have under this warranty?  
A. Each Yamaha outboard dealer is expected to:  
1. Completely set up each outboard he sells prior to delivery.  
2. Explain the operation, maintenance, and warranty requirements to your satisfaction at the time of sale, and upon your request  
at any later date.  
In addition, each Yamaha outboard dealer is held responsible for his setup, service and warranty repair work.  
Q. Is the warranty transferable to second owners?  
A. Yes. The remainder of any existing warranty can be transferred upon request. The unit has to be inspected and re-registered by an  
authorized Yamaha outboard dealer for the policy to remain effective.  
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CUSTOMER SERVICE  
If your machine requires warranty service, you must take it to any authorized Yamaha outboard dealer within the continental United  
States. Be sure to bring your warranty registration identification or other valid proof of the original date of purchase. If a question or  
problem arises regarding warranty, first contact the owner of the dealership. Since all warranty matters are handled at the dealer level,  
this person is in the best position to help you. If you are still not satisfied and require additional assistance, please write:  
YAMAHA MOTOR CORPORATION U.S.A.  
CUSTOMER RELATIONS DEPARTMENT  
P.O.Box 6555  
Cypress, California 90630  
When contacting Yamaha Motor Corporation, U.S.A. don’t forget to include any important information such as names, addresses,  
model, engine serial number, dates, and receipts.  
CHANGE OF ADDRESS  
The federal government requires each manufacturer of a motor vehicle to maintain a complete, up-to-date list of all first purchasers  
against the possibility of a safety-related defect and recall. This list is complied from the purchase registrations sent to Yamaha Motor  
Corporation, U.S.A. by the selling dealer at the time of your purchase.  
If you should move after you have purchased your new outboard, please advise us of your new address by sending a postcard listing  
your outboard model name, engine serial number, dealer number (or dealer’s name) as it is shown on your warranty identification, your  
name and new mailing address. Mail to:  
YAMAHA MOTOR CORPORATION, U.S.A.  
WARRANTY DEPARTMENT  
P.O.Box 6555  
Cypress, California 90630  
This will ensure that Yamaha Motor Corporation, U.S.A. has an up-to-date registration record in accordance with federal law.  
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EMU01178  
IMPORTANT WARRANTY INFORMATION  
IF YOU USE YOUR YAMAHA OUTSIDE U.S.A. OR CANADA  
Welcome to the Yamaha Family!  
Congratulations on the purchase of your new Yamaha marine power. Yamaha is com-  
mitted to exceptional customer satisfaction, and we want your ownership experience  
to be a satisfying one. Please read the following warranty information to help ensure  
satisfaction with your Yamaha.  
This model was manufactured as a U.S.A. specification model, and the warranty state-  
ment shown in this manual is for market. To receive the benefits of the warranty that  
applies to the country in which you use your Yamaha, please note the following infor-  
mation.  
1. The warranty on this model is the same as equivalent models sold in the country  
where you will receive service. If you need more information about your warranty  
coverage or your Yamaha outside the U.S.A. or Canada, please contact an autho-  
rized Yamaha dealer in your country.  
2. Keep a copy of your sales contract or invoice for the purchase of your Yamaha and  
present it if you need warranty repairs. This document should show the date of  
purchase, which is important evidence the repairing dealer will need to be sure  
your Yamaha is covered by warranty.  
3. If your Yamaha needs warranty repairs, contact an authorized Yamaha dealer in  
the country where you are. He will explain how to get warranty service in that  
country.  
4. This Yamaha model may not be sold in some countries. Therefore, in some cases  
your local dealer may not have all the parts or service information he may need,  
which may unavoidably delay repairs. If this happens, we thank you for your  
understanding and assure you we will attempt to resolve the situation as quickly as  
possible.  
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Printed in Japan  
April 2002-0.5 × 0.1 !  
65W-28199-16  
(F25AMH, F25AEH, F25AE, F25AET, FT25BET)  
(E)  
Printed on recycled paper  
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OUTBOARD MOTOR WARRANTY REGISTRATION  
ENREGISTREMENT DE LA GARANTIE DU MOTEUR HORS-BORD  
Please complete and mail this card. This information is necessary to accurately register your unit for warranty.  
Veuillez signer ci-dessous pour attester que le montage et l’inspection ont été faits dans le respect des directives d’inspection et  
que la marche à suivre pour la garantie et l’entretien a été expliquée à l’acheteur au détail.  
(For Dealer Use Only)  
OUTBOARD MOTOR MODEL AND SERIAL NUMBER (From I.D. label on clamp bracket)  
(A l’usage du concessionnaire)  
MODÉLE ET NO. DE SÉRIE DU MOTEUR HORS-BORD (sur l’étiquette d’identification de la presse de fixation)  
YAMAHA DEALER NUMBER  
NO. DU CONCESSIONNAIRE  
YAMAHA  
DEALER NAME  
NOM DU  
CONCESSIONNAIRE  
YAMAHA MOTOR CO., LTD.  
MADE IN JAPAN  
PAYS D'ORIGINE JAPON  
USAGE  
(Check One)  
PLEASURE  
LOISIR  
DATE SOLD  
DATE DE  
LIVRAISON  
COMMERCIAL  
COMMERCIAL  
UTILISATION  
(En cocher un.)  
MONTH  
DAY  
YEAR  
MOIS  
JOUR  
ANNÉE  
OWNER’S NAME  
NOM DU  
PROPRIÉTAIRE  
FIRST  
PRÉNOM  
LAST  
NOM DE FAMILLE  
ADDRESS  
ADRESSE  
STREET  
RUE  
CITY  
VILLE  
STATE/PROVINCE  
PROVINCE  
ZIP  
CODE POSTAL  
PHONE NUMBER (  
)
NUMÉRO DE TÉLÉPHONE  
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PLACE  
POSTAGE  
HERE  
ATTN: WARRANTY DEPARTMENT  
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