Yamaha Automobile F25D User Manual
F25D  
T25D  
OWNER’S MANUAL  
U.S.A.Edition  
LIT-18626-06-01  
65W-28199-19  
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Important manual information  
EMU25100  
al, please consult your Yamaha dealer.  
To the owner  
NOTE:  
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 ob-  
tain 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.  
In this Owner’s Manual particularly important  
information is distinguished in the following  
ways.  
The F25MH, F25ER. F25TR, F25EH, T25TR  
and the standard accessories are used as a  
base for the explanations and illustrations in  
this manual. Therefore some items may not  
apply to every model.  
EMU25110  
F25D, T25D  
OWNER’S MANUAL  
©2004 byYamaha Motor Corporation, USA  
1st edition, April 2004  
All rights reserved.  
The Safety Alert Symbol means  
ATTENTION! BECOME ALERT! YOUR  
SAFETY IS INVOLVED!  
Any reprinting or unauthorized use  
without the written permission of  
Yamaha Motor Corporation, USA  
is expressly prohibited.  
EWM00780  
Printed in Japan  
P/N LIT-18626-06-01  
WARNING  
Failure to follow WARNING instructions  
could result in severe injury or death to  
the machine operator, a bystander, or a  
person inspecting or repairing the out-  
board motor.  
ECM00700  
CAUTION:  
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 current prod-  
uct information available at the time of print-  
ing, there may be minor discrepancies  
between your machine and this manual. If  
there is any question concerning this manu-  
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Table of contents  
Starter button ..................................17  
Main switch .....................................17  
Steering friction adjuster .................17  
Steering friction adjuster .................18  
Power trim and tilt switch on  
General information ..........................1  
Identification numbers record.......... 1  
Outboard motor serial number.......... 1  
Key number....................................... 1  
Emission control information........... 1  
North American models..................... 1  
Star labels......................................... 2  
Safety information ........................... 3  
Important labels............................... 4  
Warning labels .................................. 4  
Caution labels ................................... 5  
remote control or tiller handle .......18  
Power trim and tilt switch on  
bottom engine cowling ..................18  
Trim tab with anode.........................19  
Trim tab...........................................19  
Trim rod (tilt pin)..............................20  
Tilt lock mechanism.........................20  
Tilt support knob..............................20  
Tilt support bar ................................20  
Top cowling lock lever(s) (turn  
type)..............................................21  
Flushing device ...............................21  
Warning indicator ............................21  
Tachometer.....................................21  
Digital tachometer ...........................22  
Low oil pressure warning  
Basic boating rules (Rules of the  
road) ..............................................5  
Steering and sailing rules and  
sound signals.................................. 5  
Rules when encountering vessels .... 6  
Other special situations..................... 7  
Fueling instructions ......................... 8  
Gasoline............................................ 9  
Engine oil .......................................... 9  
Battery requirement....................... 10  
Battery specifications...................... 10  
Without a rectifier or Rectifier  
Regulator ...................................... 10  
Propeller selection......................... 10  
Start-in-gear protection ................. 11  
Basic components ..........................12  
Main components.......................... 12  
Fuel tank ......................................... 13  
Fuel joint ......................................... 13  
Fuel gauge...................................... 13  
Fuel tank cap .................................. 13  
Air vent screw ................................. 13  
Remote control................................ 13  
Remote control lever....................... 13  
Neutral interlock trigger................... 14  
Neutral throttle lever........................ 14  
Tiller handle .................................... 14  
Gear shift lever................................ 14  
Throttle grip..................................... 15  
Throttle indicator ............................. 15  
Throttle friction adjuster................... 15  
Engine stop lanyard switch ............. 16  
Engine stop button.......................... 16  
Manual starter handle ..................... 17  
indicator ........................................22  
Overheat warning indicator (digital  
type)..............................................22  
Trim meter.......................................23  
Trim meter (digital type) ..................23  
Hour meter (digital type)..................23  
Warning system ............................ 24  
Overheat warning............................24  
Low oil pressure warning ................25  
Operation......................................... 26  
Installation..................................... 26  
Mounting the outboard motor..........26  
Clamping the outboard motor..........27  
Breaking in engine........................ 28  
Procedure for 4-stroke models........28  
Preoperation checks..................... 28  
Fuel .................................................28  
Controls...........................................28  
Engine.............................................29  
Checking the engine oil level ..........29  
Filling fuel...................................... 29  
Ring Free Fuel Additive...................30  
Operating engine .......................... 30  
Feeding fuel (portable tank) ............30  
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Table of contents  
Starting engine................................ 31  
Warming up engine....................... 35  
Manual start and electric start  
models .......................................... 35  
Shifting .......................................... 35  
Forward (tiller handle and remote  
Checking painted surface of  
motor.............................................54  
Periodic maintenance ................... 55  
Replacement parts..........................55  
Maintenance chart...........................56  
Maintenance chart (additional)........57  
Greasing..........................................58  
Cleaning and adjusting spark  
control models) ............................. 35  
Reverse (automatic reverse lock  
and power trim and tilt models)..... 36  
Reverse (manual tilt and hydro tilt  
plug ...............................................59  
Checking fuel system......................60  
Inspecting fuel filter .........................61  
Cleaning fuel filter ...........................61  
Inspecting idling speed....................61  
Changing engine oil ........................62  
Checking wiring and connectors .....64  
Exhaust leakage..............................64  
Water leakage.................................65  
Engine oil leakage...........................65  
Checking power trim and tilt  
system...........................................65  
Checking propeller ..........................65  
Removing the propeller...................66  
Installing the propeller.....................67  
Changing gear oil............................67  
Cleaning fuel tank ...........................68  
Inspecting and replacing  
models)......................................... 37  
Stopping engine ............................ 38  
Procedure ....................................... 38  
Trimming outboard motor.............. 38  
Adjusting trim angle for manual tilt  
models .......................................... 39  
Adjusting trim angle ........................ 40  
Adjusting boat trim .......................... 40  
Tilting up and down....................... 41  
Procedure for tilting up (manual tilt  
models)......................................... 42  
Procedure for tilting up.................... 43  
Procedure for tilting down (manual  
tilt models) .................................... 44  
Procedure for tilting down ............... 44  
Cruising in shallow water .............. 44  
Cruising in shallow water (manual  
tilt models) .................................... 45  
Power trim and tilt models / power  
tilt models...................................... 46  
Cruising in other conditions........... 47  
Maintenance.....................................48  
Specifications................................ 48  
Transporting and storing outboard  
motor ...........................................50  
Clamp screw mounting models....... 50  
Storing outboard motor ................... 51  
Procedure ....................................... 51  
Lubrication (except oil injection  
anode(s)........................................69  
Checking battery (for electric start  
models) .........................................69  
Connecting the battery....................70  
Disconnecting the battery................71  
Checking top cowling ......................71  
Coating the boat bottom..................71  
Trouble Recovery............................ 72  
Troubleshooting............................ 72  
Temporary action in emergency ... 75  
Impact damage ...............................75  
Replacing fuse ................................75  
Power trim and tilt will not  
models)......................................... 52  
Cleaning and anticorrosion  
measures...................................... 52  
Battery care..................................... 53  
Flushing power unit......................... 53  
Cleaning the outboard motor .......... 54  
operate..........................................76  
Starter will not operate ....................76  
Emergency starting engine .............77  
Treatment of submerged motor .... 78  
Procedure........................................78  
Consumer information ................... 79  
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Table of contents  
Important warranty information for  
U.S.A. and Canada .....................79  
YAMAHA MOTOR  
CORPORATION, U.S.A.  
FOUR-STROKE OUTBOARD  
MOTOR  
THREE-YEAR LIMITED  
WARRANTY ................................81  
IMPORTANT WARRANTY  
INFORMATION IF YOU USE  
YOUR YAMAHA OUTSIDE  
U.S.A. OR CANADA ...................83  
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General information  
EMU25170  
reference in case you need a new key.  
Identification numbers record  
EMU25182  
Outboard motor serial number  
The outboard motor serial number is  
stamped on the label attached to the port  
side of the clamp bracket or the upper part of  
the swivel bracket.  
Record your outboard motor serial number in  
the spaces provided to assist you in ordering  
spare parts from your Yamaha dealer or for  
reference in case your outboard motor is sto-  
len.  
1. Key number  
EMU25220  
Emission control information  
EMU25230  
North American models  
1
This engine conforms to U.S. Environmental  
Protection Agency (EPA) regulations for ma-  
rine SI engines. See the label affixed to your  
ZMU02638  
engine for details.  
EMU25242  
1. Outboard motor serial number location  
Approval label of emission control certif-  
icate  
This label is attached to the bottom cowling.  
New Technology; (4-stroke/HPDI) EM  
1
EMU25190  
Key number  
If a main key switch is equipped with the mo-  
tor, the key identification number is stamped  
on your key as shown in the illustration.  
Record this number in the space provided for  
ZMU04990  
1. Approval label location  
1
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General information  
particular label.  
1
ZMU01699  
ZMU04991  
EMU25261  
Manufactured date label  
This label is attached to the clamp bracket or  
1. Star labels location  
the swivel bracket.  
EMU25280  
One Star—Low Emission  
The one-star label identifies engines that  
meet the Air Resources Board’s 2001 ex-  
haust emission standards. Engines meeting  
these standards have 75% lower emissions  
than conventional carbureted two-stroke en-  
gines. These engines are equivalent to the  
U.S. EPA’s 2006 standards for marine en-  
gines.  
1
ZMU04973  
1. Manufactured date label location  
Manufactured:  
ZMU01702  
EMU25290  
Two Stars—Very Low Emission  
The two-star label identifies engines that  
ZMU04346  
meet the Air Resources Board’s 2004 ex-  
haust emission standards. Engines meeting  
these standards have 20% lower emissions  
than One Star-Low-Emission engines.  
EMU25272  
Star labels  
Your outboard motor is labeled with a Cali-  
fornia Air Resources Board (CARB) star la-  
bel. See below for a description of your  
2
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General information  
the outboard should be equal to or less  
than the rated horsepower capacity of the  
boat. If the rated horsepower capacity of  
the boat is unknown, consult the dealer or  
boat manufacturer.  
G Do not modify the outboard. Modifications  
could make the motor unfit or unsafe to  
use.  
G Never operate after drinking alcohol or tak-  
ing drugs. About 50% of all boating fatali-  
ties involve intoxication.  
ZMU01703  
EMU25300  
Three Stars—Ultra Low Emission  
G Have an approved personal flotation de-  
vice (PFD) on board for every occupant. It  
is a good idea to wear a PFD whenever  
boating. At a minimum, children and non-  
swimmers should always wear PFDs, and  
everyone should wear PFDs when there  
are potentially hazardous boating condi-  
tions.  
The three-star label identifies engines that  
meet the Air Resources Board’s 2008 ex-  
haust emission standards. Engines meeting  
these standards have 65% lower emissions  
than One Star-Low-Emission engines.  
G Gasoline is highly flammable, and its va-  
pors are flammable and explosive. Handle  
and store gasoline carefully. Make sure  
there are no gas fumes or leaking fuel be-  
fore starting the engine.  
G This product emits exhaust gases which  
contain carbon monoxide, a colorless,  
odorless gas which may cause brain dam-  
age or death when inhaled. Symptoms in-  
clude nausea, dizziness, and drowsiness.  
Keep cockpit and cabin areas well ventilat-  
ed. Avoid blocking exhaust outlets.  
G Check throttle, shift, and steering for prop-  
er operation before starting the engine.  
G Attach the engine stop switch lanyard cord  
to a secure place on your clothing, or your  
arm or leg while operating. If you acciden-  
tally leave the helm, the cord will pull from  
the switch, stopping the engine.  
ZMU01704  
EMU25361  
Safety information  
G Before mounting or operating the outboard  
motor, read this entire manual. Reading it  
should give you an understanding of the  
motor and its operation.  
G Before operating the boat, read any own-  
er’s or operator’s manuals supplied with it  
and all labels. Be sure you understand  
each item before operating.  
G Know the marine laws and regulations  
where you will be boating—and obey  
them. For basic boating rules, see “Rules  
G Do not overpower the boat with this out-  
board motor. Overpowering the boat could  
result in loss of control. The rated power of  
3
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General information  
EMU25380  
EMU25395  
of the road” on page 5.  
Important labels  
G Stay informed about the weather. Check  
weather forecasts before boating. Avoid  
boating in hazardous weather.  
Warning labels  
G Tell someone where you are going: leave  
a Float Plan with a responsible person. Be  
sure to cancel the Float Plan when you re-  
turn.  
G Use common sense and good judgment  
when boating. Know your abilities, and be  
sure you understand how your boat han-  
dles 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.  
G Always watch carefully for swimmers dur-  
ing the engine operation.  
G Stay away from swimming areas.  
G When a swimmer is in the water near you  
shift into neutral and shut off the engine.  
Be informed about boating safety. Additional  
publications and information can be obtained  
from many organizations, including the fol-  
lowing:  
ZMU04342  
EMU25401  
Label  
EWM01260  
WARNING  
G Be sure shift control is in neutral before  
starting engine. (except 2HP)  
G Do not touch or remove electrical parts  
when starting or during operation.  
G Keep hands, hair, and clothes away  
from flywheel and other rotating parts  
while engine is running.  
EMU25431  
United States Coast Guard  
Consumer Affairs Staff (G-BC)  
Label  
EWM01300  
Office of Boating, Public, and Consumer Af-  
fairs  
U.S. Coast Guard Headquarters  
Washington, D.C. 20593-0001  
Boating Safety Hotline: 1-800-368-5647  
National Marine Manufacturers Associa-  
tion (NMMA)  
WARNING  
G This engine is equipped with a neutral  
starting device.  
G The engine will not start unless the shift  
control is in neutral position.  
401 N. Michigan Ave.  
Chicago, Il 60611  
Marine Retailers Association of America  
155 N. Michigan Ave.  
Chicago, Il 60601  
4
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General information  
EMU25464  
EMU25510  
Caution labels  
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 “burdened” vessel.  
These rules determine which vessel has the  
right-of-way, and what each vessel should  
do.  
ZMU02640  
Stand-on vessel  
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.  
EMU25472  
Label  
ECM01190  
CAUTION:  
Transport and store the engine only as  
shown. Otherwise, engine damage could  
result from Leaking oil.  
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 brief-  
ly 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.  
EMU25500  
Basic boating rules (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 agen-  
cies. You should be aware of these rules,  
and follow them whenever you encounter  
another vessel on the water.  
“The general prudential rule”  
This rule is called Rule 2 in the International  
Rules and says,  
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 pro-  
vided for your convenience only. Consult  
your local U.S. Coast Guard Auxiliary or De-  
partment of Motor Vehicles for a complete  
set of rules governing the waters in which  
you will be using your boat.  
“In obeying and construing these rules due  
regard shall be had to all dangers of naviga-  
tion and collision, and to any special circum-  
stances, which may render a departure from  
the above rules necessary in order to avoid  
immediate danger.”  
In other words, follow the standard rules ex-  
cept when a collision will occur unless both  
vessels try to avoid each other. If that is the  
case, both vessels become “Give-Way” ves-  
5
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General information  
sels.  
EMU25520  
Rules when encountering vessels  
There are three main situations which you  
may encounter with other vessels which  
could lead to a collision unless the Steering  
Rules are followed:  
Meeting: (you are approaching another ves-  
sel head-on)  
Crossing: (you are traveling across the oth-  
er vessel’s path)  
Overtaking: (you are passing or being  
passed by another vessel)  
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 oth-  
er 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  
vessel is on your port (left) side, remember  
that you should maintain course and direc-  
tion, 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 vessels in the shad-  
ed area must yield to you (they are the Give-  
Way vessels). Both you and the meeting  
vessel must alter course to avoid each other.  
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 ves-  
sel on your port (left) side. This rule doesn’t  
apply if both of you will clear one another if  
you continue on your set course and speed.  
Overtaking  
If you are passing another vessel, you are  
the “Give-Way” vessel. This means that the  
other vessel is expected to maintain its  
course and speed. You must stay out of its  
way until you are clear of it. Likewise, if an-  
other vessel is passing you, you should  
maintain your speed and direction so that the  
other vessel can steer itself around you.  
6
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General information  
EMU25530  
Reading buoys and other markers  
Other special situations  
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 navigat-  
ing in a particular direction. The markings on  
these buoys are oriented from the perspec-  
tive of being entered from seaward (the boat-  
er is going towards the port). This means that  
red buoys are passed on the starboard  
(right) side when proceeding from open wa-  
ter into port, and black buoys are to port (left)  
side. When navigating out of port, your posi-  
tion with respect to the buoys should be re-  
versed; red buoys should be to port and  
black buoys to starboard.  
Many bodies of water used by boaters are  
entirely within the boundaries of a particular  
state. The Uniform State Waterway Marking  
System has been devised for these waters.  
This system uses buoys and signs with dis-  
tinctive shapes and colors to show regulato-  
ry or advisory information. These markers  
are white with black letters and orange  
boarders. They signify speed zones, restrict-  
ed areas, danger areas, and general infor-  
mation.  
There are three other rules you should be  
aware of when driving your boat around oth-  
er 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 wa-  
ter vessels, the operator should sound a pro-  
longed 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 pro-  
ceed around the bend with caution. If you  
navigate such waters with your boat, you will  
need to carry a portable air horn, available  
from local marine supply stores.  
Fishing vessel right-of-way  
All vessels which are fishing with nets, lines  
or trawls are considered to be “fishing ves-  
sels” under the International Rules. Vessels  
with trolling lines are not considered fishing  
vessels. Fishing vessels have the right-of-  
way regardless of position. Fishing vessels  
cannot, however, impede the passage of  
other vessels in narrow channels.  
Sailing vessel right-of-way  
Remember, markings may vary by geo-  
graphic location. Always consult local boat-  
ing authorities before driving your boat in  
unfamiliar waters.  
Sailing vessels should normally be given the  
right-of-way. The exceptions to this are:  
1. When the sailing vessel is overtaking  
the power-driven vessel, the power-driv-  
en 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 navi-  
gate only in such a channel.  
7
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General information  
ZMU01708  
EMU25540  
away from sparks, flames, or other  
Fueling instructions  
sources of ignition.  
EWM00010  
G Stop engine before refueling.  
G Refuel in a well-ventilated area. Refuel  
portable fuel tanks off the boat.  
G Take care not to spill gasoline. If gaso-  
line spills, wipe it up immediately with  
WARNING  
GASOLINE AND ITS VAPORS ARE HIGH-  
LY FLAMMABLE AND EXPLOSIVE!  
G Do not smoke when refueling, and keep  
8
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General information  
EMU25680  
dry rags.  
Engine oil  
G Do not overfill the fuel tank.  
G Tighten the filler cap securely after re-  
fueling.  
G If you should swallow some gasoline,  
inhale a lot of gasoline vapor, or get  
gasoline in your eyes, get immediate  
medical attention.  
G If any gasoline spills onto your skin, im-  
mediately wash with soap and water.  
Change clothing if gasoline spills on it.  
G Touch the fuel nozzle to the filler open-  
ing or funnel to help prevent electro-  
static sparks.  
Recommended engine oil:  
4-stroke motor oil with a combination  
of corresponding SAE and API as  
shown in the chart  
Engine oil quantity (excluding oil filter):  
F25EH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25ER 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25MH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25TR 1.7 L (1.80 US qt) (1.50 Imp.qt)  
T25TR 1.9 L (2.01 US qt) (1.67 Imp.qt)  
ECM00010  
CAUTION:  
Use only new clean gasoline which has  
been stored in clean containers and is not  
contaminated with water or foreign mat-  
ter.  
EMU25570  
Gasoline  
If knocking or pinging occurs, use a different  
brand of gasoline or premium unleaded fuel.  
ECM01050  
CAUTION:  
Recommended gasoline:  
All 4-stroke engines are shipped from the  
factory without engine oil.  
Regular unleaded gasoline with a min-  
imum octane rating of 86 (Pump Oc-  
tane Number) = (R+M)/2  
Gasohol  
There are two types of gasohol: gasohol con-  
taining ethanol and that containing metha-  
nol. Gasohol containing ethanol can be used  
if ethanol content does not exceed 10% and  
the fuel meets minimum octane ratings.  
Yamaha does not recommended gasohol  
containing methanol because it can cause  
fuel system damage or engine performance  
problems.  
ZMU01710  
9
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General information  
EMU25690  
Yamaha dealer for details on installing an  
Battery requirement  
optional Rectifier Regulator.  
EMU25741  
ECM01060  
CAUTION:  
Propeller selection  
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.  
The performance of your outboard motor will  
be critically affected by your choice of propel-  
ler, 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.  
For electric start models, choose a battery  
which meets the following specifications.  
EMU25711  
Yamaha outboard motors are fitted with pro-  
pellers 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 suit-  
able as it enables the correct engine speed  
to be maintained. Conversely, a larger-pitch  
propeller is more suitable for a smaller oper-  
ating load.  
Battery specifications  
Minimum cold cranking amps (CCA/  
SAE):  
245.0 A  
Minimum marine cranking amps (MCA/  
ABYC):  
323.0 A  
Minimum reserve capacity (RC/SAE):  
52 minutes  
Yamaha dealers stock a range of propellers,  
and can advise you and install a propeller on  
your outboard that is best suited to your ap-  
plication.  
EMU25730  
Without a rectifier or Rectifier  
Regulator  
ECM01090  
CAUTION:  
A battery cannot be connected to models  
that do not have a rectifier or Rectifier  
Regulator.  
x
-
1
2 3  
If you wish to use a battery with the models  
without a rectifier or Rectifier Regulator, in-  
stall an optional Rectifier Regulator.  
Using a maintenance-free battery with the  
above models can shorten the life of the bat-  
tery significantly.  
Install an optional Rectifier Regulator or use  
accessories rated to withstand 18 volts or  
higher with the above models. Consult your  
ZMU04604  
1. Propeller diameter in inches  
2. Propeller pitch in inches  
3. Type of propeller (propeller mark)  
10  
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General information  
x
-
1
2 3  
ZMU04605  
1. Propeller diameter in inches  
2. Propeller pitch in inches  
3. Type of propeller (propeller mark)  
NOTE:  
Select a propeller which will allow the engine  
to reach the middle or upper half of the oper-  
ating range at full throttle with the maximum  
boat load. If operating conditions such as  
light boat loads then allow the engine r/min to  
rise above the maximum recommended  
range, reduce the throttle setting to maintain  
the engine in the proper operating range.  
For instructions on propeller removal and in-  
stallation, see page 65.  
EMU25770  
Start-in-gear protection  
Yamaha outboard motors or Yamaha-ap-  
proved remote control units are equipped  
with start-in-gear protection device(s). This  
feature permits the engine to be started only  
when it is in neutral. Always select neutral  
before starting the engine.  
11  
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Basic components  
EMU25795  
Main components  
NOTE:  
* May not be exactly as shown; also may not be included as standard equipment on all mod-  
els.  
F25D, T25D  
12  
13  
14 17  
23  
22  
21  
1
16  
15  
20  
11  
18  
19  
2
3
10  
9
25  
4
24  
26  
28  
27  
5
6
8
7
29  
30  
ZMU04992  
1. Top cowling  
15. Engine stop button/Engine stop lanyard  
switch*  
16. Throttle friction adjuster*  
17. Tiller handle*  
2. Cooling water pilot hole  
3. Top cowling lock lever(s)  
4. Drain screw  
18. Steering friction lever  
19. Transom clamp handle*  
20. Rope attachment  
21. Tilt lock lever*  
5. Anti-cavitation plate  
6. Trim tab (anode)  
7. Propeller  
8. Cooling water inlet  
9. Trim rod*  
22. Flushing device*  
23. Starter button*  
10. Clamp bracket  
24. Tilt support knob*  
25. Fuel tank*  
26. Remote control box (side mount type)*  
27. Remote control cable*  
28. Tachometer*  
11. Power trim and tilt switch*  
12. Manual starter handle*  
13. Warning indicator*  
14. Gear shift lever*  
12  
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Basic components  
the tank can be filled with fuel. To remove the  
29. Trim meter*  
cap, turn it counterclockwise.  
EMU25860  
30. Digital tachometer*  
EMU25802  
Air vent screw  
This screw is on the fuel tank cap. To loosen  
Fuel tank  
If your model was equipped with a portable  
fuel tank, its function is as follows.  
EWM00020  
the screw, turn it counterclockwise.  
EMU26180  
Remote control  
WARNING  
The remote control lever actuates both the  
shifter and the throttle. The electrical switch-  
es are mounted on the remote control box.  
The fuel tank supplied with this engine is  
its dedicated fuel reservoir and must not  
be used as a fuel storage container. Com-  
mercial users should conform to relevant  
licensing or approval authority regula-  
tions.  
1. Power trim and tilt switch  
2. Remote control lever  
3. Neutral interlock trigger  
4. Neutral throttle lever  
5. Main switch / choke switch  
6. Engine stop lanyard switch  
7. Throttle friction adjuster  
1. Fuel joint  
2. Fuel gauge  
3. Fuel tank cap  
4. Air vent screw  
EMU26190  
Remote control lever  
EMU25830  
Moving the lever forward from the neutral po-  
sition engages forward gear. Pulling the le-  
ver back from neutral engages reverse. The  
engine will continue to run at idle until the le-  
ver is moved about 35° (a detent can be felt).  
Moving the lever farther opens the throttle,  
and the engine will begin to accelerate.  
Fuel joint  
This joint is used to connect the fuel line.  
EMU25841  
Fuel gauge  
This gauge is located on either the fuel tank  
cap or on the fuel joint base. It shows the ap-  
proximate amount of fuel remaining in the  
tank.  
EMU25850  
Fuel tank cap  
This cap seals the fuel tank. When removed,  
13  
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Basic components  
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.  
1. Neutral “ ”  
2. Forward “ ”  
3. Reverse “ ”  
4. Shift  
5. Fully closed  
6. Throttle  
7. Fully open  
1. Fully open  
2. Fully closed  
EMU25911  
EMU26201  
Tiller handle  
To change direction, move the tiller handle to  
the left or right as necessary.  
Neutral interlock trigger  
To shift out of neutral, first pull the neutral in-  
terlock trigger up.  
ZMU01997  
EMU25922  
1. Neutral interlock trigger  
Gear shift lever  
Pulling the gear shift lever towards you puts  
the engine in forward gear so that the boat  
moves ahead. Pushing the lever away from  
you puts the engine in reverse gear so that  
the boat moves astern.  
EMU26211  
Neutral throttle lever  
To open the throttle without shifting into ei-  
ther forward or reverse, put the remote con-  
trol lever in the neutral position and lift the  
neutral throttle lever.  
NOTE:  
The neutral throttle lever will operate only  
14  
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Basic components  
R
3
N
2
1
F
1
START  
ZMU02285  
ZMU02286  
1. Throttle indicator  
1. Forward “ ”  
2. Neutral “ ”  
3. Reverse “ ”  
EMU25970  
Throttle friction adjuster  
A friction device provides adjustable resis-  
tance to movement of the throttle grip or the  
remote control lever, and can be set accord-  
ing to operator preference.  
To increase resistance, turn the adjuster  
clockwise. To decrease resistance, turn the  
EMU25941  
Throttle grip  
The throttle grip is on the tiller handle. Turn  
the grip counterclockwise to increase speed  
and clockwise to decrease speed.  
adjuster counterclockwise.  
EWM00030  
WARNING  
Do not overtighten the friction adjuster. If  
there is too much resistance, it could be  
difficult to move throttle lever or grip,  
which could result in an accident.  
ZMU01999  
EMU25961  
Throttle indicator  
The fuel consumption curve on the throttle  
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.  
15  
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Basic components  
NOTE:  
The engine cannot be started with the lock  
plate removed.  
ZMU02001  
When constant speed is desired, tighten the  
adjuster to maintain the desired throttle set-  
ting.  
EMU25990  
1. Lanyard  
2. Lock plate  
Engine stop lanyard switch  
The lock plate must be attached to the en-  
gine stop switch for the engine to run. The  
lanyard should be attached to a secure place  
on the operator’s clothing, or arm or leg.  
Should the operator fall overboard or leave  
the helm, the lanyard will pull out the lock  
plate, stopping ignition to the engine. This  
will prevent the boat from running away un-  
2
der power.  
EWM00120  
1
WARNING  
ZMU02003  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
1. Lanyard  
2. Lock plate  
G 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.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
EMU26001  
Engine stop button  
To open the ignition circuit and stop the en-  
gine, push this button.  
16  
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Basic components  
EMU26090  
Main switch  
The main switch controls the ignition system;  
its operation is described below.  
G “  
” (off)  
With the main switch in the “  
” (off) posi-  
tion, the electrical circuits are off, and the key  
can be removed.  
G “ ” (on)  
ZMU02083  
With the main switch in the “ ” (on) posi-  
tion, the electrical circuits are on, and the key  
cannot be removed.  
EMU26070  
Manual starter handle  
G “  
” (start)  
To start the engine, first gently pull the han-  
dle out until resistance is felt. From that posi-  
tion, then pull the handle straight out quickly  
to crank the engine.  
With the main switch in the “  
” (start) po-  
sition, the starter motor turns to start the en-  
gine. When the key is released, it returns  
automatically to the “ ” (on) position.  
ZMU02287  
EMU26080  
EMU26110  
Starter button  
Steering friction adjuster  
A friction device provides adjustable resis-  
tance to the steering mechanism, and can be  
set according to operator preference. An ad-  
juster lever is located on the bottom of the  
tiller handle bracket.  
To start the engine with the electric starter,  
push the starter button.  
To increase resistance, turn the lever to the  
left.  
To decrease resistance, turn the lever to the  
right.  
EWM00040  
WARNING  
ZMU02809  
Do not overtighten the friction adjuster. If  
there is too much resistance, it could be  
17  
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Basic components  
EMU26141  
difficult to steer, which could result in an  
accident.  
Power trim and tilt switch on remote  
control or tiller handle  
The power trim and tilt system adjusts the  
outboard motor angle in relation to the tran-  
som. Pressing the switch “ ” (up) trims the  
outboard motor up, then tilts it up. Pressing  
the switch “ ” (down) tilts the outboard mo-  
tor down and trims it down. When the switch  
is released, the outboard motor will stop in its  
current position.  
ZMU02810  
NOTE:  
For instructions on using the power trim and  
EMU26122  
tilt switch, see pages 38 and 41.  
Steering friction adjuster  
A friction device provides adjustable resis-  
tance to the steering mechanism, and can be  
set according to operator preference. An ad-  
justing screw or bolt is located on the swivel  
bracket.  
EMU26151  
Power trim and tilt switch on bottom  
engine cowling  
The power trim and tilt switch is located on  
the side of the bottom engine cowling. Press-  
ing the switch “ ” (up) trims the outboard  
motor up, then tilts it up. Pressing the switch  
ZMU02288  
To increase resistance, turn the adjuster  
clockwise.  
To decrease resistance, turn the adjuster  
“
” (down) tilts the outboard motor down  
and trims it down. When the switch is re-  
leased, the outboard motor will stop in its  
counterclockwise.  
EWM00040  
current position.  
EWM01030  
WARNING  
Do not overtighten the friction adjuster. If  
there is too much resistance, it could be  
difficult to steer, which could result in an  
accident.  
WARNING  
Use the power trim and tilt switch located  
on the bottom engine cowling only when  
the boat is at a complete stop with the en-  
gine off. Attempting to use this switch  
18  
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Basic components  
while the boat is moving could increase protect the engine from electrochemical  
the risk of falling overboard and could corrosion. Never paint the trim tab as it  
distract the operator, increasing the risk will become ineffective as an anode.  
of collision with another boat or an obsta-  
cle.  
A
1
B
UP  
DN  
2
ZMU02822  
1. Trim tab  
2. Bolt  
ZMU02811  
NOTE:  
EMU26250  
For instructions on using the power trim and  
tilt switch, see page 41.  
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.  
EWM00840  
EMU26240  
Trim tab with anode  
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  
WARNING  
force.  
An improperly adjusted trim tab could  
cause difficult steering. Always test run  
after the trim tab has been installed or re-  
placed to be sure steering is correct. Be  
sure you have tightened the bolt after ad-  
justing the trim tab.  
EWM00840  
WARNING  
An improperly adjusted trim tab could  
cause difficult steering. Always test run  
after the trim tab has been installed or re-  
placed to be sure steering is correct. Be  
sure you have tightened the bolt after ad-  
justing the trim tab.  
If the boat tends to veer the left (port side),  
turn the trim tab rear end to the port side “A”  
in the figure.  
If the boat tends to veer the left (port side),  
turn the trim tab rear end to the port side “A”  
in the figure. If the boat tends to veer the right  
(starboard side), turn the trim tab end to the  
If the boat tends to veer the right (starboard  
side), turn the trim tab end to the starboard  
side “B” in the figure.  
starboard side “B” in the figure.  
ECM00840  
CAUTION:  
The trim tab also serves as an anode to  
19  
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Basic components  
1
A
1
B
2
ZMU02291  
ZMU02289  
1. Tilt lock lever  
1. Trim tab  
2. Bolt  
To lock it, set the tilt lock lever in the lock po-  
sition. To release, push the tilt lock lever in  
the release position.  
EMU26320  
EMU26261  
Trim rod (tilt pin)  
The position of the trim rod determines the  
minimum trim angle of the outboard motor in  
relation to the transom.  
Tilt support knob  
To keep the outboard motor in the tilted up  
position, push the tilt support knob under the  
swivel bracket.  
ZMU02889  
EMU30530  
ZMU02812  
Tilt lock mechanism  
The tilt lock mechanism is used to prevent  
the outboard motor from lifting out of the wa-  
ter when in reverse gear.  
EMU26330  
Tilt support bar  
The tilt support bar keeps the outboard motor  
in the tilted up position.  
20  
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Basic components  
1
ZMU02292  
ZMU02813  
EMU26372  
1. Flushing device  
Top cowling lock lever(s) (turn type)  
To remove the engine top cowling, turn the  
lock lever(s) and lift off the cowling. When in-  
stalling the cowling, check to be sure it fits  
properly in the rubber seal. Then lock the  
cowling again by returning the lever(s) to the  
lock position.  
EMU26300  
Warning indicator  
If the engine develops a condition which is  
cause for warning, the indicator lights up. For  
details on how to read the warning indicator,  
see page 24.  
1
ZMU02009  
ZMU02293  
EMU26470  
1. Top cowling lock lever(s)  
Tachometer  
This gauge shows the engine speed and has  
EMU26460  
Flushing device  
the following functions.  
This device is used to clean the cooling wa-  
ter passages of the motor using a garden  
hose and tap water.  
NOTE:  
For details on usage, see page 53.  
21  
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Basic components  
warning indicators only operate when the en-  
gine is equipped with the appropriate func-  
tions.  
1
EMU26521  
Low oil pressure warning indicator  
If oil pressure drops too low, the warning in-  
dicator will start to blink. For further informa-  
tion, see page 25.  
ECM00020  
2
ZMU04578  
CAUTION:  
G Do not continue to run the engine if the  
low oil pressure warning indicator is on  
and the engine oil level is lower. Seri-  
ous engine damage will occur.  
G The low oil pressure warning indicator  
does not indicate the engine oil level.  
Use the oil dipstick to check the re-  
maining oil quantity. For further infor-  
mation, see page 29.  
1. Tachometer  
2. Warning indicator(s)  
EMU26491  
Digital tachometer  
The tachometer shows the engine speed  
and has the following functions.  
NOTE:  
All segments of the display will light momen-  
tarily after the main switch is turned on and  
will return to normal thereafter.  
1
2
3
1
ZMU01736  
4
5
1. Low oil pressure warning indicator  
7
6
ZMU01840  
EMU26581  
1. Tachometer  
2. Trim meter  
3. Hour meter  
Overheat warning indicator (digital  
type)  
4. Low oil pressure warning indicator  
5. Overheat warning indicator  
6. Set button  
If the engine temperature rises too high, the  
warning indicator will start to blink. For fur-  
ther information on reading the indicator, see  
page 24.  
ECM00050  
7. Mode button  
NOTE:  
CAUTION:  
Do not continue to run the engine if the  
The water separator and engine trouble  
22  
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Basic components  
overheat warning indicator is on. Serious  
engine damage will occur.  
Adjust the trim angle to the desired using  
the power trim and tilt switch.  
G If the trim angle of your motor exceeds the  
trim operating range, the top segment on  
the trim meter display will blink.  
1
ZMU01737  
1. Overheat warning indicator  
ZMU01740  
EMU26610  
Trim meter  
EMU26650  
This gauge shows the trim angle of your out-  
board motor.  
Hour meter (digital type)  
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.  
ZMU04581  
NOTE:  
Memorize the trim angles that work best for  
your boat under different conditions. Adjust  
the trim angle to the desired setting with the  
power trim and tilt switch.  
ZMU01741  
G Changing the display format  
G Pressing the “  
” (mode) button chang-  
EMU26620  
es the display format in the following pat-  
tern:  
G Total hours→Trip hours→Display off  
G Resetting the trip hours  
Trim meter (digital type)  
This meter shows the trim angle of your out-  
board motor.  
NOTE:  
G Simultaneously pressing the “ ” (set)  
G Memorize the trim angles that work best  
for your boat under different conditions.  
and “  
” (mode) buttons for more than  
23  
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Basic components  
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.  
EMU26801  
Warning system  
ECM00090  
CAUTION:  
ZMU04746  
Do not continue to operate the engine if a  
warning device has activated. Consult  
your Yamaha dealer if the problem can-  
not be located and corrected.  
G The overheat warning indicator will light (if  
equipped on the bottom cowling or the ta-  
chometer).  
G The buzzer will sound (if equipped on the  
tiller handle, remote control box, or main  
switch panel).  
EMU26813  
Overheat warning  
This engine has an overheat warning device.  
If the engine temperature rises too high, the  
warning device will activate.  
Activation of warning device  
G The engine speed will automatically de-  
crease to about 2000 r/min.  
ZMU02360  
If the warning system has activated, stop the  
engine and check the cooling water inlet for  
clogging.  
ZMU04045  
24  
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Basic components  
EMU30164  
Low oil pressure warning  
If the oil pressure drops too low, the warning  
device will activate.  
Activation of warning device  
G The engine speed will automatically de-  
crease to about 2000 r/min.  
ZMU02360  
If the warning system has activated, stop the  
engine as soon as it is safe to do so. Check  
the oil level and add oil as needed. If the oil  
level is correct and the warning device does  
not switch off, consult your Yamaha dealer.  
ECM00100  
ZMU04994  
CAUTION:  
G The low oil pressure warning indicator will  
light.  
Do not continue to run the engine if the  
low oil pressure warning indicator is on.  
Serious engine damage could occur.  
ZMU02294  
G The buzzer will sound (if equipped on the  
tiller handle, remote control box, or main  
switch panel).  
25  
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Operation  
EMU26901  
specific boat and motor combination.  
Installation  
EWM00830  
ECM00110  
WARNING  
CAUTION:  
Improper mounting of the outboard mo-  
tor could result in hazardous conditions  
such as poor handling, loss of control, or  
fire hazards. Observe the following:  
G For permanently mounted models, your  
dealer or other person experienced in  
proper rigging should mount the motor.  
If you are mounting the motor yourself,  
you should be trained by an experi-  
enced person.  
Incorrect engine height or obstructions  
to smooth water flow (such as the design  
or condition of the boat, or accessories  
such as transom ladders or depth finder  
transducers) can create airborne water  
spray while the boat is cruising. Severe  
engine damage may result if the motor is  
operated continuously in the presence of  
airborne water spray.  
G For portable models, your dealer or oth-  
er person experienced in proper out-  
board motor mounting should show  
you how to mount your motor.  
NOTE:  
During water testing check the buoyancy of  
the boat, at rest, with its maximum load.  
Check that the static water level on the ex-  
haust housing is low enough to prevent wa-  
ter entry into the powerhead, when water  
rises due to waves when the outboard is not  
running.  
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.  
EMU26910  
Mounting the outboard motor  
EWM00820  
WARNING  
G Overpowering a boat could cause se-  
vere instability. Do not install an out-  
board motor with more horsepower  
than the maximum rating on the capac-  
ity plate of the boat. If the boat does not  
have a capacity plate, consult the boat  
manufacturer.  
G The information presented in this sec-  
tion is intended as reference only. It is  
not possible to provide complete in-  
structions for every possible boat and  
motor combination. Proper mounting  
depends in part on experience and the  
1
ZMU01760  
1. Center line (keel line)  
EMU26920  
Mounting height  
To run your boat at optimum efficiency, the  
water resistance (drag) of the boat and out-  
board motor must be made as little as possi-  
ble. The mounting height of the outboard  
26  
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Operation  
motor greatly affects the water resistance. If  
the mounting height is too high, cavitation  
tends to occur, thus reducing the propulsion;  
and if the propeller tips cut the air, the engine  
speed will rise abnormally and cause the en-  
gine to overheat. If the mounting height is too  
low, the water resistance will increase and  
thereby reduce engine efficiency. Mount the  
outboard motor so that the anti-cavitation  
plate is between the bottom of the boat and  
a level 25 mm (1 in.) below it.  
come loose due to engine vibration.  
EWM00640  
WARNING  
Loose clamp screws could allow the out-  
board motor to fall off or move on the  
transom. This could cause loss of control  
and serious injury. Make sure the tran-  
som screws are tightened securely. Oc-  
casionally check the screws for tightness  
during operation.  
0–25mm  
ZMU02012  
(0–1in.)  
ZMU02011  
2. If the engine restraint cable attachment  
is equipped on your engine, an engine  
restraint cable or chain should be used.  
Attach one end to the engine restraint  
cable attachment and the other to a se-  
cure mounting point on the boat. Other-  
wise the engine could be completely lost  
if it accidentally falls off the transom.  
NOTE:  
G The optimum mounting height of the out-  
board motor is affected by the boat and  
motor combination and the desired use.  
Test runs at different heights can help de-  
termine the optimum mounting height.  
Consult your Yamaha dealer or boat man-  
ufacturer for further information on deter-  
mining the proper mounting height.  
G For instructions on setting the trim angle of  
the outboard motor, see page 38.  
EMU26970  
Clamping the outboard motor  
1. Place the outboard motor on the tran-  
som so that it is positioned as close to  
the center as possible. Tighten the tran-  
som clamp screws evenly and securely.  
Occasionally check the clamp screws  
for tightness during operation of the out-  
board motor because they could be-  
ZMU02013  
3. Secure the clamp bracket to the transom  
using the bolts provided with the out-  
27  
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Operation  
board (if packed). For details, consult  
Run the engine at 2000 r/min or at ap-  
proximately half throttle.  
your Yamaha dealer.  
EWM00650  
2. For the second hour of operation:  
Run the engine at 3000 r/min or at ap-  
proximately three-quarter throttle.  
3. For the next eight hours of operation:  
Avoid continuous operation at full throt-  
tle for more than five minutes at a time.  
4. After the first 10 hours:  
WARNING  
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 tighten-  
ing, test run the engine and check their  
tightness.  
Operate the engine normally.  
EMU27101  
Preoperation checks  
EWM00080  
WARNING  
If any item in the preoperation check is  
not working properly, have it inspected  
and repaired before operating the out-  
board motor. Otherwise an accident  
could occur.  
1
ECM00120  
ZMU02637  
CAUTION:  
Do not start the engine out of water. Over-  
heating and serious engine damage can  
occur.  
1. Bolts  
EMU30172  
Breaking in engine  
EMU27110  
Fuel  
Your new engine requires a period of break-  
in to allow mating surfaces of moving parts to  
wear in evenly. Correct break-in will help en-  
sure proper performance and longer engine  
G Check to be sure you have plenty of fuel  
for your trip.  
G Make sure there are no fuel leaks or gaso-  
line fumes.  
G Check fuel line connections to be sure they  
are tight (if equipped Yamaha fuel tank or  
boat tank).  
G Be sure the fuel tank is positioned on a se-  
cure, flat surface, and that the fuel line is  
not twisted or flattened, or likely to contact  
sharp objects (if equipped Yamaha fuel  
life.  
ECM00800  
CAUTION:  
Failure to follow the break-in procedure  
could result in reduced engine life or  
even severe engine damage.  
EMU27080  
Procedure for 4-stroke models  
Run the engine under load (in gear with a  
propeller installed) as follows.  
1. For the first hour of operation:  
tank or boat tank).  
EMU27130  
Controls  
G Check throttle, shift, and steering for prop-  
28  
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Operation  
er operation before starting the engine.  
G The controls should work smoothly, with-  
out binding or unusual free play.  
G Look for loose or damaged connections.  
G Check operation of the starter and stop  
switches when the outboard motor is in the  
1
3
2
water.  
EMU27140  
Engine  
ZMU02082  
G Check the engine and engine mounting.  
G Look for loose or damaged fasteners.  
G Check the propeller for damage.  
EMU27163  
1. Lower level mark  
2. Oil dipstick  
3. Upper level mark  
Checking the engine oil level  
1. Put the outboard motor in an upright po-  
sition (not tilted).  
2. Remove oil dipstick and wipe it clean.  
3. Completely insert the dipstick and re-  
move it again.  
NOTE:  
Be sure to completely insert the dipstick into  
the dipstick guide.  
EMU27433  
Filling fuel  
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.  
EWM00060  
WARNING  
Gasoline and its vapors are highly flam-  
mable and explosive. Keep away from  
sparks, cigarettes, flames, or other  
sources of ignition.  
1. Remove the fuel tank cap.  
2. Carefully fill the fuel tank.  
3. Securely close the cap after filling the  
tank. Wipe up any spilled fuel.  
1
Fuel tank capacity:  
25L  
ZMU02833  
1. Oil dipstick  
29  
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Operation  
EMU27450  
EMU27461  
Operating engine  
Feeding fuel (portable tank)  
EWM00420  
WARNING  
G 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.  
ZMU04047  
EMU27270  
G When the air vent screw is loosened,  
gasoline vapor will be released. Gaso-  
line is highly flammable, and its vapors  
are flammable and explosive. Refrain  
from smoking, and keep away from  
open flames and sparks while loosen-  
ing the air vent screw.  
G This product emits exhaust gases  
which contain carbon monoxide, a col-  
orless, odorless gas which could cause  
brain damage or death when inhaled.  
Symptoms include nausea, dizziness,  
and drowsiness. Keep cockpit and cab-  
in areas well ventilated. Avoid blocking  
exhaust outlets.  
Ring Free Fuel Additive  
Gasoline is a precise blend of many different  
substances, each chosen to give certain  
characteristics. Gasoline blends have been  
changing in recent years in response to con-  
cerns about pollution and resulting emis-  
sions regulations. One of the most obvious  
changes has been the elimination of lead  
from most fuels.  
As gasoline has changed, the amount of ad-  
ditives such as aromatics and oxygenates  
has increased. These additives are impor-  
tant for the engines in passenger cars, but  
they can have detrimental effects in marine  
engines, because of increased deposits in  
the combustion chamber. When enough de-  
posits collect, piston rings begin sticking.  
Performance drops and engine wear in-  
creases dramatically.  
1. If there is an air vent screw on the fuel  
tank cap, loosen it 2 or 3 turns.  
While many additives available may reduce  
deposits, Yamaha recommends the use of  
Ring Free Fuel Additive, available from  
your Yamaha dealer. Ring Free Fuel Addi-  
tive 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 la-  
beling for use instructions.  
ZMU02022  
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  
30  
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Operation  
EMU27490  
line to the joint on the fuel tank.  
Starting engine  
EMU27541  
Starting engine  
1. Place the gear shift lever in neutral.  
N
ZMU02296  
ZMU02304  
NOTE:  
The start-in-gear protection device prevents  
the engine from starting except when in neu-  
tral.  
2. 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 into the en-  
ZMU02024  
3. If a steering friction adjuster is provided  
on your outboard motor, securely attach  
the fuel line to the fuel line clamp.  
gine stop switch.  
EWM00120  
NOTE:  
WARNING  
During engine operation place the tank hori-  
zontally, otherwise fuel cannot be drawn  
from the fuel tank.  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
4. Squeeze the primer pump with the outlet  
end up until you feel it become firm.  
G 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.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
ZMU02025  
31  
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Operation  
NOTE:  
G When the engine is cold, it needs to be  
warmed up. For further information, see  
page 35.  
G If the engine is warm and fails to start,  
open the throttle slightly and try to start the  
engine again. If the engine still fails to  
start, see page 72.  
EMU27600  
ZMU02026  
Electric start/prime start models  
1. Place the gear shift lever in neutral.  
3. Place the throttle grip in the “  
”
(start) position.  
N
START  
START  
ZMU02304  
ZMU02335  
NOTE:  
4. Pull the manual starter handle slowly un-  
til you feel resistance. Then give a  
strong pull straight out to crank and start  
the engine. Repeat if necessary.  
The start-in-gear protection device prevents  
the engine from starting except when in neu-  
tral.  
2. 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 into the en-  
gine stop switch.  
EWM00120  
WARNING  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
ZMU02336  
G 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.  
G Avoid accidentally pulling the lanyard  
5. After the engine starts, slowly return the  
manual starter handle to its original po-  
sition before releasing it.  
32  
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Operation  
during normal operation. Loss of en-  
gine 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.  
ZMU02809  
5. Immediately after the engine starts, re-  
lease the starter button and allow it to re-  
turn to its original position.  
ECM00160  
CAUTION:  
G Never push the starter button while the  
engine is running.  
ZMU02026  
3. Place the throttle grip in the “  
”
G Do not keep the starter motor turning  
for more than 5 seconds. If the starter  
motor is turned continuously for more  
than 5 seconds, the battery will be  
quickly discharged, thus making it im-  
possible to start the engine. The starter  
can also be damaged. If the engine will  
not start after 5 seconds of cranking,  
release the starter button, wait 10 sec-  
onds, then crank the engine again.  
(start) position. After the engine starts,  
return the throttle to the fully closed po-  
sition.  
START  
START  
NOTE:  
G When the engine is cold, it needs to be  
warmed up. For further information, see  
page 35.  
G If the engine is warm and fails to start,  
open the throttle slightly and try to start the  
engine again. If the engine still fails to  
start, see page 72.  
ZMU02335  
4. Push the starter button to start the en-  
gine.  
EMU27662  
Electric start and remote control models  
1. Place the remote control lever in neutral.  
33  
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Operation  
3. Turn the main switch to “ ” (on).  
NOTE:  
4. Turn the main switch to “  
” (start),  
The start-in-gear protection device prevents  
the engine from starting except when in neu-  
tral.  
and hold it for a maximum of 5 seconds.  
2. 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 into the en-  
gine stop switch.  
EWM00120  
WARNING  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
5. Immediately after the engine starts, re-  
lease the main switch and allow it to re-  
G 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.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
turn to “ ” (on).  
ECM00191  
CAUTION:  
G Never turn the main switch to “  
(start) while the engine is running.  
”
G Do not keep the starter motor turning  
for more than 5 seconds. If the starter  
motor is turned continuously for more  
than 5 seconds, the battery will be  
quickly discharged, thus making it im-  
possible to start the engine. The starter  
can also be damaged. If the engine will  
not start after 5 seconds of cranking,  
return the main switch to “ ” (on), wait  
10 seconds, then crank the engine  
34  
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Operation  
again.  
cooling water pilot hole is blocked.  
Consult your Yamaha dealer if the prob-  
lem cannot be located and corrected.  
NOTE:  
G When the engine is cold, it needs to be  
warmed up. For further information, see  
page 35.  
G If the engine is warm and fails to start,  
open the throttle slightly and try to start the  
engine again. If the engine still fails to  
start, see page 72.  
EMU27670  
Warming up engine  
EMU27710  
ZMU02034  
Manual start and electric start  
models  
EMU27740  
Shifting  
1. After starting the engine, allow it to idle  
for 3 minutes to warm up. Failure to do  
so will shorten engine life.  
EWM00180  
WARNING  
Before shifting, make sure there are no  
swimmers or obstacles in the water near  
you.  
2. Be sure the low oil pressure warning in-  
dicator goes off after starting the engine.  
3. Check for a steady flow of water from the  
ECM00220  
cooling water pilot hole.  
ECM00210  
CAUTION:  
CAUTION:  
To change the boat direction or shifting  
position from forward to reverse or vice-  
versa, first close the throttle so that the  
engine idles (or runs at low speeds).  
G If the low oil pressure warning indicator  
does not go off after the engine starts,  
stop the engine. Otherwise serious en-  
gine damage could occur. Check the oil  
level and add oil if necessary. Consult  
your Yamaha dealer if the cause for the  
low oil pressure warning indicator can-  
not be found.  
G A continuous flow of water from the pi-  
lot 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 en-  
gine is running, overheating and seri-  
ous damage could occur. Stop the  
engine and check whether the cooling  
water inlet on the lower case or the  
EMU27763  
Forward (tiller handle and remote  
control models)  
Tiller control models  
1. Place the throttle grip in the fully closed  
position.  
35  
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Operation  
EMU27784  
Reverse (automatic reverse lock and  
power trim and tilt models)  
EWM00190  
WARNING  
START  
When operating in reverse, go slowly. Do  
not open the throttle more than half. Oth-  
erwise the boat could become unstable,  
which could result in loss of control and  
an accident.  
ZMU02297  
2. Move the gear shift lever quickly and  
firmly from neutral to forward.  
Tiller control models  
1. Place the throttle grip in the fully closed  
position.  
N
F
START  
ZMU02298  
ZMU02297  
Remote control models  
2. Move the gear shift lever quickly and  
firmly from neutral to reverse.  
1. Pull up the neutral interlock trigger (if  
equipped) and move the remote control  
lever quickly and firmly from neutral to  
forward.  
R
N
ZMU02300  
Remote control models  
1. Pull up the neutral interlock trigger (if  
equipped) and move the remote control  
lever quickly and firmly from neutral to  
reverse.  
36  
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Operation  
ZMU02299  
EMU27795  
3. Move the gear shift lever quickly and  
firmly from neutral to reverse.  
Reverse (manual tilt and hydro tilt  
models)  
EWM00190  
R
N
WARNING  
When operating in reverse, go slowly. Do  
not open the throttle more than half. Oth-  
erwise the boat could become unstable,  
which could result in loss of control and  
an accident.  
Tiller control models  
ZMU02300  
1. Place the throttle grip in the fully closed  
position.  
Remote control models  
1. Check that the tilt lock lever is in the lock  
position.  
START  
ZMU02297  
2. On models equipped with a tilt lock le-  
ver, check that it is in the lock/down po-  
sition.  
ZMU02299  
2. Pull up the neutral interlock trigger (if  
equipped) and move the remote control  
lever quickly and firmly from neutral to  
reverse.  
37  
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Operation  
the fuel line if there is a fuel joint on the  
outboard motor.  
EMU27820  
ZMU02302  
Stopping engine  
Before stopping the engine, first let it cool off  
for a few minutes at idle or low speed. Stop-  
ping the engine immediately after operating  
3. Tighten the air vent screw on the fuel  
tank cap (if equipped).  
at high speed is not recommended.  
EMU27844  
Procedure  
1. Push and hold the engine stop button or  
turn the main switch to “  
” (off).  
ZMU02041  
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 switch, then turning the main  
ZMU02083  
switch to “  
” (off).  
EMU27861  
Trimming outboard motor  
The trim angle of the outboard motor helps  
determine the position of the bow of the boat  
in the water. Correct trim angle will help im-  
prove performance and fuel economy while  
reducing strain on the engine. Correct trim  
angle depends upon the combination of  
boat, engine, and propeller. Correct trim is  
2. After stopping the engine, disconnect  
38  
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Operation  
also affected by variables such as the load in 2. Remove the trim rod from the clamp  
the boat, sea conditions, and running speed.  
EWM00740  
bracket while slightly tilting the outboard  
motor up.  
WARNING  
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 in-  
creases 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.  
1
ZMU02890  
1. Trim rod  
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 to-  
ward the transom.  
Make test runs with the trim set to different  
angles to find the position that works best for  
your boat and operating conditions.  
EWM00400  
WARNING  
G Stop the engine before adjusting the  
trim angle.  
G Use care to avoid being pinched when  
removing or installing the rod.  
G Use caution when trying a trim position  
for the first time. Increase speed gradu-  
ally and watch for any signs of instabil-  
ity or control problems. Improper trim  
angle can cause loss of control.  
1
ZMU02641  
1. Trim operating angle  
EMU27871  
NOTE:  
Adjusting trim angle for manual tilt  
The outboard motor trim angle can be  
changed approximately 4 degrees by shifting  
the trim rod one hole.  
models  
There are 4 or 5 holes provided in the clamp  
bracket to adjust the outboard motor trim an-  
gle.  
1. Stop the engine.  
39  
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Operation  
EMU27881  
Adjusting trim angle  
Power trim and tilt models  
EWM00750  
WARNING  
G Be sure all people are clear of the out-  
board motor when adjusting the tilt an-  
gle, also be careful not to pinch any  
body parts between the drive unit and  
clamp bracket.  
UP  
DN  
ZMU02811  
G Use caution when trying a trim position  
for the first time. Increase speed gradu-  
ally and watch for any signs of instabil-  
ity or control problems. Improper trim  
angle can cause loss of control.  
G Use the power tilt switch located on the  
bottom engine cowling (if equipped)  
only when the boat is at a complete  
stop with the engine off.  
To raise the bow (trim-out), press the switch  
” (up).  
To lower the bow (trim-in), press the switch  
” (down).  
Make test runs with the trim set to different  
angles to find the position that works best for  
your boat and operating conditions.  
“
“
NOTE:  
To adjust the trim angle while the boat is  
moving, use the power trim and tilt switch lo-  
cated on the remote control device or tiller  
handle, if equipped.  
Adjust the outboard motor trim angle using  
the power trim and tilt switch.  
EMU27911  
Adjusting boat trim  
When the boat is on plane, a bow-up attitude  
results in less drag, greater stability and effi-  
ciency. This is generally when the keel line of  
the boat is up about 3 to 5 degrees. With the  
bow up, the boat may have a greater tenden-  
cy to steer to one side or the other. Compen-  
sate for this as you steer. The trim tab can  
also be adjusted to help offset this effect.  
When the bow of the boat is down, it is easier  
to accelerate from a standing start onto  
plane.  
1. Power trim and tilt switch  
40  
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Operation  
Bow Up  
NOTE:  
Too much trim-out puts the bow of the boat  
too high in the water. Performance and econ-  
omy are decreased because the hull of the  
boat is pushing the water and there is more  
air drag. Excessive trim-out can also cause  
the propeller to ventilate, which reduces per-  
formance further, and the boat may “por-  
poise” (hop in the water), which could throw  
the operator and passengers overboard.  
Depending on the type of boat, the outboard  
motor trim angle may have little effect on the  
trim of the boat when operating.  
EMU27933  
Tilting up and down  
If the engine will be stopped for some time or  
if the boat is moored in shallows, the out-  
board motor should be tilted up to protect the  
propeller and casing from damage by colli-  
sion with obstructions, and also to reduce  
salt corrosion.  
EWM00220  
WARNING  
Be sure all people are clear of the out-  
board motor when tilting up and down,  
also be careful not to pinch any body  
parts between the drive unit and engine  
bracket.  
EWM00250  
Bow Down  
WARNING  
Too much trim-in causes the boat to “plow”  
through the water, decreasing fuel economy  
and making it hard to increase speed. Oper-  
ating 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 opera-  
tion difficult and dangerous.  
Leaking fuel is a fire hazard. If there is a  
fuel joint on the outboard motor, discon-  
nect the fuel line or close the fuel cock if  
the engine will be tilted for more than a  
few minutes. Otherwise fuel may leak.  
ECM00241  
CAUTION:  
G Before tilting the outboard motor, stop  
the engine by following the procedure  
41  
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Operation  
on page 38. Never tilt the outboard mo-  
tor while the engine is running. Severe  
damage from overheating can result.  
G Do not tilt up the engine by pushing the  
tiller handle (if equipped) because this  
could break the handle.  
EMU27976  
Procedure for tilting up (manual tilt  
models)  
ZMU02302  
1. Place the gear shift lever in neutral.  
3. Place the tilt lock lever (if equipped) in  
the release/up position.  
N
ZMU02304  
ZMU02305  
N
4. Pull up the shallow water lever (if  
equipped).  
5. Hold the rear of the top cowling with one  
hand and tilt the engine up fully.  
6. Push the tilt support knob into the clamp  
bracket. Or the tilt support bar will turn to  
the lock position automatically.  
ZMU03087  
2. Disconnect the fuel line from the out-  
board motor.  
ZMU02292  
42  
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Operation  
EMU28005  
Procedure for tilting up  
Power trim and tilt models / power tilt models  
1. Place the remote control lever / the gear  
shift lever in neutral.  
N
ZMU02304  
UP  
ZMU02823  
4. Push the tilt support knob into the clamp  
bracket or pull the tilt support lever to-  
ward you to support the engine.  
2. Disconnect the fuel line from the out-  
board motor or close the fuel cock.  
ZMU02812  
EWM00260  
WARNING  
After tilting the outboard motor, be sure  
to support it with the tilt support knob or  
tilt support lever. Otherwise the outboard  
motor could fall back down suddenly if oil  
in the power trim and tilt unit loses pres-  
ZMU02302  
3. Press the power trim and tilt switch /  
power tilt switch “ ” (up) until the out-  
board motor has tilted up completely.  
43  
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Operation  
sure.  
the tilt support knob.  
5. Models equipped with trim rods: Once  
the outboard motor is supported with the  
tilt support lever, press the power trim  
and tilt switch “ ” (down) to retract the  
trim rods.  
ECM00250  
CAUTION:  
Be sure to retract the trim rods complete-  
ly during mooring. This protects the rods  
from marine growth and corrosion which  
could damage the power trim and tilt  
mechanism.  
ZMU02825  
3. Push the power tilt / power trim and tilt  
switch “ ” (down) to lower the outboard  
motor to the desired position.  
EMU30190  
Procedure for tilting down (manual  
tilt models)  
1. Place the tilt lock lever in the lock posi-  
UP  
DN  
DN  
tion.  
ZMU01936  
ZMU02306  
2. Slightly tilt the engine up until the tilt sup-  
port bar is automatically released.  
3. Slowly tilt the engine down.  
EMU28052  
DN  
Procedure for tilting down  
ZMU02826  
Power trim and tilt models / power tilt models  
1. Push the power tilt / power trim and tilt  
switch “ ” (up) until the outboard motor  
EMU28060  
Cruising in shallow water  
is supported by the tilt rod and the tilt The outboard motor can be tilted up partially  
support lever / tilt support knob becomes to allow operation in shallow water.  
free.  
2. Release the tilt support lever or pull out  
44  
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Operation  
EMU28071  
Cruising in shallow water (manual tilt  
models)  
EWM00710  
WARNING  
G Place the gear shift in neutral before us-  
ing the shallow water cruising system.  
G 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 outboard motor to lift out of  
the water, resulting in loss of control.  
G Do not rotate the outboard motor 180°  
and operate the boat in reverse. Place  
the gear shift in reverse to operate the  
boat in reverse.  
ZMU02830  
EMU28123  
Procedure  
1. Place the gear shift lever in neutral.  
N
G Use extra care when operating in re-  
verse. Too much reverse thrust can  
cause the outboard motor to lift out of  
the water, increasing the chance of ac-  
cident and personal injury.  
G Return the outboard motor to its normal  
position as soon as the boat is back in  
deeper water.  
ZMU02304  
2. Place the tilt lock lever in the release/up  
position.  
ECM00260  
CAUTION:  
Do not tilt the outboard motor up so that  
the cooling water inlet on the lower unit is  
above the surface of the water when set-  
ting up for and cruising in shallow water.  
Otherwise severe damage from overheat-  
ing can result.  
ZMU02305  
3. Slightly tilt the outboard motor up. The  
tilt support bar will lock automatically,  
supporting the outboard motor in a par-  
tially raised position.  
NOTE:  
This outboard motor has 2 positions for shal-  
45  
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Operation  
EMU28184  
low water cruising.  
Procedure for power trim and tilt / power  
tilt models  
1. Place the gear shift lever in neutral.  
4. To return the outboard motor to the nor-  
mal running position, place the gear shift  
lever in neutral, then place the tilt lock le-  
ver in the lock/down position.  
ZMU02306  
N
5. Slightly tilt the outboard motor up until  
the tilt support bar automatically returns  
to the free position.  
6. Slowly lower the outboard motor to the  
normal position.  
EMU28090  
Power trim and tilt models / power tilt  
models  
ZMU02304  
The outboard motor can be tilted up partially  
to allow operation in shallow water.  
EWM00660  
2. Slightly tilt the outboard motor up to the  
desired position using the power trim / tilt  
switch.  
WARNING  
G Place the gear shift in neutral before  
setting up for shallow water cruising.  
G Return the outboard motor to its normal  
position as soon as the boat is back in  
deeper water.  
UP  
UP  
DN  
ECM00260  
CAUTION:  
Do not tilt the outboard motor up so that  
the cooling water inlet on the lower unit is  
above the surface of the water when set-  
ting up for and cruising in shallow water.  
Otherwise severe damage from overheat-  
ing can result.  
ZMU01935  
46  
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Operation  
UP  
ZMU02823  
3. To return the outboard motor to the nor-  
mal running position, press the power  
trim / tilt switch and slowly tilt the out-  
board motor down.  
EMU28190  
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 with  
salt deposits.  
NOTE:  
For cooling system flushing instructions, see  
page 50.  
Cruising in turbid water  
Yamaha strongly recommends that you use  
the optional chromium-plated water pump kit  
if you use the outboard motor in turbid (mud-  
dy) water conditions.  
47  
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Maintenance  
EMU28216  
F25ER 67.0 kg (148 lb)  
F25MH 64.0 kg (141 lb)  
F25TR 71.0 kg (157 lb)  
T25TR 86.7 kg (191 lb)  
Specifications  
Dimension:  
Overall length:  
F25EH 1151 mm (45.3 in)  
Weight (AL) X:  
90.0 kg (198 lb)  
Performance:  
F25ER 703 mm (27.7 in)  
F25MH 1151 mm (45.3 in)  
F25TR 703 mm (27.7 in)  
T25TR 713 mm (28.1 in)  
Full throttle operating range:  
5000–6000 r/min  
Overall width:  
Maximum output:  
F25EH 430 mm (16.9 in)  
F25ER 376 mm (14.8 in)  
F25MH 430 mm (16.9 in)  
F25TR 376 mm (14.8 in)  
T25TR 373 mm (14.7 in)  
18.4 kW@5500 r/min (25 HP@5500  
r/min)  
Idling speed (in neutral):  
F25EH 925 50 r/min  
F25ER 925 50 r/min  
F25MH 975 50 r/min  
F25TR 925 50 r/min  
T25TR 975 50 r/min  
Overall height S:  
1148 mm (45.2 in)  
Overall height L:  
F25EH 1275 mm (50.2 in)  
F25ER 1275 mm (50.2 in)  
F25MH 1275 mm (50.2 in)  
F25TR 1275 mm (50.2 in)  
T25TR 1311 mm (51.6 in)  
Engine:  
Type:  
4-stroke L  
Displacement:  
3
498.0 cm (30.39 cu.in)  
Bore × stroke:  
65.0 × 75.0 mm (2.56 × 2.95 in)  
Ignition system:  
Overall height X:  
1425 mm (56.1 in)  
Transom height S:  
423 mm (16.7 in)  
Transom height L:  
CDI (micro computer)  
Spark plug (NGK):  
DPR6EA-9  
Spark plug gap:  
0.8–0.9 mm (0.031–0.035 in)  
Control system:  
F25EH 550 mm (21.7 in)  
F25ER 550 mm (21.7 in)  
F25MH 550 mm (21.7 in)  
F25TR 550 mm (21.7 in)  
T25TR 528 mm (20.8 in)  
Transom height X:  
F25EH Tiller  
F25ER Remote control  
F25MH Tiller  
642 mm (25.3 in)  
Weight (AL) S:  
F25TR Remote control  
T25TR Remote control  
Starting system:  
F25EH 66.0 kg (146 lb)  
F25ER 65.0 kg (143 lb)  
F25MH 62.0 kg (137 lb)  
Weight (AL) L:  
F25EH Electric  
F25ER Electric  
F25EH 68.0 kg (150 lb)  
F25MH Manual  
48  
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Maintenance  
F25TR Electric  
Regular unleaded gasoline  
T25TR Electric  
Starting carburetion system:  
Prime start  
Valve clearance (cold engine) IN:  
0.15–0.25 mm (0.0059–0.0098 in)  
Valve clearance (cold engine) EX:  
0.25–0.35 mm (0.0098–0.0138 in)  
Min. cold cranking amps (CCA/SAE):  
245.0 A  
Min. pump octane:  
86  
Recommended engine oil:  
4-stroke outboard motor oil  
Engine oil grade API:  
API SE, SF, SG, SH, SJ  
Engine oil type SAE:  
SAE10W30 or SAE10W40  
Lubrication:  
Min. marine cranking amps (MCA/ABYC):  
323.0 A  
Min. reserve capacity (RC/SAE):  
52 minutes  
Wet sump  
Engine oil quantity (excluding oil filter):  
F25EH 1.7 L (1.80 US qt) (1.50  
Imp.qt)  
Alternator output:  
F25ER 1.7 L (1.80 US qt) (1.50  
Imp.qt)  
80 W  
Alternator output for battery DC:  
15.0 A  
F25MH 1.7 L (1.80 US qt) (1.50  
Imp.qt)  
Drive unit:  
Gear positions:  
Forward-neutral-reverse  
Gear ratio:  
F25EH 2.08 (27/13)  
F25TR 1.7 L (1.80 US qt) (1.50  
Imp.qt)  
T25TR 1.9 L (2.01 US qt) (1.67  
Imp.qt)  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
F25ER 2.08 (27/13)  
F25MH 2.08 (27/13)  
F25TR 2.08 (27/13)  
T25TR 2.42 (29/12)  
Trim and tilt system:  
F25EH Manual tilt  
F25ER Manual tilt  
F25MH Manual tilt  
F25TR Power trim and tilt  
T25TR Power trim and tilt  
Propeller mark:  
3
F25EH 320.0 cm (10.82 US oz)  
(11.29 Imp.oz)  
F25ER 320.0 cm (10.82 US oz)  
3
(11.29 Imp.oz)  
F25MH 320.0 cm (10.82 US oz)  
3
(11.29 Imp.oz)  
F25TR 320.0 cm (10.82 US oz)  
3
(11.29 Imp.oz)  
T25TR 430.0 cm (14.54 US oz)  
3
F25EH F  
F25ER F  
F25MH F  
(15.17 Imp.oz)  
Tightening torque for engine:  
Spark plug:  
F25TR F  
T25TR G  
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)  
Propeller nut:  
Fuel and oil:  
F25EH 35.0 Nm (25.8 ft-lb) (3.57  
kgf-m)  
Recommended fuel:  
49  
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Maintenance  
F25ER 35.0 Nm (25.8 ft-lb) (3.57  
kgf-m)  
F25MH 35.0 Nm (25.8 ft-lb) (3.57  
kgf-m)  
tilted, even if a motor support bar is used.  
Severe injury could occur if the outboard  
motor accidentally falls.  
ECM00660  
F25TR 35.0 Nm (25.8 ft-lb) (3.57  
kgf-m)  
T25TR 40.0 Nm (29.5 ft-lb) (4.08  
kgf-m)  
CAUTION:  
Do not use the tilt support lever or knob  
when trailering the boat. The outboard  
motor could shake loose from the tilt sup-  
port and fall. If the motor cannot be trail-  
ered in the normal running position, use  
an additional support device to secure it  
in the tilt position.  
Engine oil drain bolt:  
F25EH 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
F25ER 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
The outboard motor should be trailered and  
stored in the normal running position. If there  
is insufficient road clearance in this position,  
then trailer the outboard motor in the tilt po-  
sition using a motor support device such as  
a transom saver bar. Consult your Yamaha  
dealer for further details.  
F25MH 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
F25TR 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
T25TR 18.0 Nm (13.3 ft-lb) (1.84  
kgf-m)  
Engine oil filter:  
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)  
EMU28222  
Transporting and storing  
outboard motor  
EWM00690  
WARNING  
G Leaking fuel is a fire hazard. When  
transporting and storing the outboard  
motor, close the air vent screw and fuel  
cock to prevent fuel from leaking.  
G USE CARE when transporting fuel tank,  
whether in a boat or car.  
G 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.  
ZMU02831  
EMU28235  
Clamp screw mounting models  
When transporting or storing the outboard  
motor while removed from a boat, keep the  
outboard motor in the attitude shown.  
EWM00700  
WARNING  
Never get under the lower unit while it is  
50  
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Maintenance  
and storing it. If storing or transporting  
the outboard motor on its side (not up-  
right), put it on a cushion after draining  
the engine oil.  
G Do not place the outboard motor on its  
side before the cooling water has  
drained from it completely, otherwise  
water may enter the cylinder through  
the exhaust port and cause engine trou-  
ble.  
ZMU02831  
G Store the outboard motor in a dry, well-  
ventilated place, not in direct sunlight.  
EMU28301  
Procedure  
EMU28372  
Flushing in a test tank  
1. Wash the outboard motor body using  
fresh water. For further information, see  
page 54.  
2. 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.  
ZMU02050  
NOTE:  
Place a towel or something similar under the  
outboard motor to protect it from damage.  
NOTE:  
EMU28241  
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.  
Storing outboard motor  
When storing your Yamaha outboard motor  
for prolonged periods of time (2 months or  
longer), several important procedures must  
be performed to prevent excessive damage.  
It is advisable to have your outboard motor  
serviced by an authorized Yamaha dealer  
prior to storage. However, you, the owner,  
with a minimum of tools, can perform the fol-  
3. Remove the engine top cowling and si-  
lencer cover.  
4. Install the outboard motor on the test  
tank.  
lowing procedures.  
ECM01080  
CAUTION:  
G To prevent problems which can be  
caused by oil entering the cylinder from  
the sump, keep the outboard motor in  
the attitude shown when transporting  
51  
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Maintenance  
when starting or during operation.  
G Keep hands, hair, and clothes away  
from the flywheel and other rotating  
parts while the engine is running.  
1
2
7. Run the engine at a fast idle for 10–15  
minutes in neutral position.  
8. Just prior to turning off the engine, quick-  
ly spray “Yamaha Stor-Rite Engine  
Fogging Oil” (Part No. LUB-STRRT-12-  
00) alternately into each carburetor or  
the fogging hole of the silencer cover, if  
equipped. When properly done, the en-  
gine will smoke excessively and almost  
stall.  
9. Remove the outboard motor from the  
test tank.  
10. Drain the cooling water completely out  
of the motor. Clean the body thoroughly.  
11. Install the silencer cover/cap and top  
ZMU02051  
1. Water surface  
2. Lowest water level  
5. Fill the tank with fresh water to above the  
level of the anti-cavitation plate.  
ECM00300  
CAUTION:  
Do not run the engine without supplying  
it with cooling water. Either the engine  
water pump will be damaged or the en-  
gine will be damaged from overheating.  
Before starting the engine, be sure to  
supply water to the cooling water passag-  
es.  
cowling.  
EMU28400  
Lubrication (except oil injection  
models)  
1. Grease the spark plug threads and in-  
stall the spark plug(s) and torque to  
proper specification. For information on  
spark plug installation, see page 59.  
2. Change the gear oil. For instructions,  
see page 67. Inspect the oil for the pres-  
ence of water that indicates a leaky seal.  
Seal replacement should be performed  
by an authorized Yamaha dealer prior to  
use.  
ECM00290  
CAUTION:  
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.  
6. Cooling system flushing is essential to  
prevent the cooling system from clog-  
ging up with salt, sand, or dirt. In addi-  
tion, fogging of the engine is mandatory  
to prevent excessive engine damage  
due to rust. Perform the flushing and  
3. Grease all grease fittings. For further de-  
tails, see page 58.  
EMU28421  
Cleaning and anticorrosion  
measures  
fogging at the same time.  
EWM00090  
1. Wash down the exterior of the outboard  
motor with fresh water and dry off com-  
pletely.  
WARNING  
G Do not touch or remove electrical parts  
52  
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Maintenance  
2. Spray the outboard motor exterior with FLUID OUT OF REACH OF CHILDREN.  
“Yamaha Silicone Protectant” (Part No.  
LUB-SILCNE-13-00).  
3. Wax the cowling with a non-abrasive  
Batteries vary among manufacturers. There-  
fore the following procedures may not al-  
ways  
apply.  
Consult  
your  
battery  
wax such as “Yamaha Silicone Wax”  
manufacturer’s instructions.  
Procedure  
(Part No. ACC-11000-15-02).  
EMU28430  
1. Disconnect and remove the battery from  
the boat. Always disconnect the black  
negative cable first to prevent the risk of  
shorting.  
2. Clean the battery casing and terminals.  
Fill each cell to the upper level with dis-  
tilled water.  
3. Store the battery on a level surface in a  
cool, dry, well-ventilated place out of di-  
rect sunlight.  
4. Once a month, check the specific gravity  
of the electrolyte and recharge as re-  
Battery care  
EWM00330  
WARNING  
Battery electrolytic fluid is dangerous; it  
contains sulfuric acid and therefore is  
poisonous and highly caustic.  
Always follow these preventive mea-  
sures:  
G Avoid bodily contact with electrolytic  
fluid as it can cause severe burns or  
permanent eye injury.  
G Wear protective eye gear when han-  
dling or working near batteries.  
Antidote (EXTERNAL):  
quired to prolong battery life.  
EMU28440  
Flushing power unit  
Perform this procedure right after operation  
for the most thorough flushing.  
1. After shutting off the engine, unscrew  
the garden hose connector from the fit-  
ting on the bottom cowling.  
G SKIN - Flush with water.  
G EYES - Flush with water for 15 minutes  
and get immediate medical attention.  
Antidote (INTERNAL):  
G 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 hydro-  
gen gas; therefore, you should always  
follow these preventive measures:  
G Charge batteries in a well-ventilated ar-  
ea.  
G Keep batteries away from fire, sparks,  
or open flames (for example: welding  
equipment, lighted cigarettes, and so  
on.)  
G DO NOT SMOKE when charging or han-  
dling batteries.  
KEEP BATTERIES AND ELECTROLYTIC  
53  
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Maintenance  
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.  
NOTE:  
G When flushing the engine with the boat in  
the water, tilting up the outboard motor un-  
til it is completely out of the water will  
achieve better results.  
1
2
3
G For cooling system flushing instructions,  
see page 50.  
EMU28450  
Cleaning the outboard motor  
After use, wash the exterior of the outboard  
motor with fresh water. Flush the cooling  
system with fresh water.  
ZMU02819  
1. Fitting  
2. Garden hose connector  
3. Garden hose  
2. Screw the garden hose connector onto a  
garden hose which is connected to a  
fresh water supply.  
ZMU02832  
3. With the engine off, turn on the water tap  
and let the water flush through the cool-  
ing passages for about 15 minutes. Turn  
off the water and disconnect the garden  
hose.  
NOTE:  
For cooling system flushing instructions, see  
page 50.  
EMU28460  
Checking painted surface of motor  
Check the motor for scratches, nicks, or flak-  
ing paint. Areas with damaged paint are  
more likely to corrode. If necessary, clean  
and paint the areas. A touch-up paint is avail-  
able from your Yamaha dealer.  
4. When flushing is complete, reinstall the  
garden hose connector on the fitting on  
the bottom cowling. Tighten the connec-  
tor securely.  
ECM00540  
CAUTION:  
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  
54  
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Maintenance  
EMU28483  
EWM01070  
Periodic maintenance  
WARNING  
Be sure to turn off the engine when you  
perform maintenance unless otherwise  
specified. If you or the owner is not famil-  
iar with machine servicing, this work  
should be done by your Yamaha dealer or  
other qualified mechanic.  
Maintenance, replacement, or repair of  
the emission control devices and sys-  
tems 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 your Yamaha dealer for owners who  
have the mechanical skills, tools, and other  
equipment necessary to perform mainte-  
nance not covered by this owner’s manual.  
EMU28510  
Replacement parts  
If replacement parts are necessary, use only  
genuine Yamaha parts or parts of the same  
type and of equivalent strength and materi-  
als. Any part of inferior quality may malfunc-  
tion, and the resulting loss of control could  
endanger the operator and passengers.  
Yamaha genuine parts and accessories are  
available from your Yamaha dealer.  
55  
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Maintenance  
EMU28521  
Maintenance chart  
Frequency of maintenance operations may be adjusted according to the operating condi-  
tions, but the following table gives general guidelines. Refer to the sections in this chapter for  
explanations of each owner-specific action.  
The “ ” symbol indicates the check-ups which you may carry out yourself.  
The “ ” symbol indicates work to be carried out by your Yamaha dealer.  
Initial  
Every  
50 hours  
100  
hours (6  
months)  
200  
hours (1  
year)  
Item  
Actions  
10 hours  
(1 month)  
(3  
months)  
Inspection / replace-  
ment  
Anode(s) (external)  
Inspection / replace-  
ment  
Anode(s) (internal)  
Battery  
Inspection / charging  
Cooling water pas-  
sages  
Cleaning  
Cowling clamp  
Inspection  
Fuel filter (can be dis-  
assembled)  
Inspection / cleaning  
Inspection  
Fuel system  
Fuel tank (Yamaha por-  
table tank)  
Inspection / cleaning  
Gear oil  
Change  
Greasing points  
Greasing  
Idling speed (carbure-  
tor models)  
Inspection / adjustment  
Power trim and tilt unit  
Inspection  
Inspection / replace-  
ment  
Propeller and cotter pin  
Shift link / shift cable  
Thermostat  
Inspection / adjustment  
Inspection  
Throttle link / throttle  
cable / throttle pick-up  
timing  
Inspection / adjustment  
Water pump  
Inspection  
Engine oil  
Inspection / change  
Change  
Oil filter (cartridge)  
56  
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Maintenance  
Initial  
50 hours  
Every  
100  
200  
hours (1  
year)  
Item  
Actions  
10 hours  
(1 month)  
(3  
hours (6  
months)  
months)  
Cleaning / adjustment /  
replacement  
Inspection / replace-  
ment  
Spark plug(s)  
Timing belt  
Valve clearance (OHC,  
OHV)  
Inspection / adjustment  
NOTE:  
When operating in salt water, turbid or muddy water, the engine should be flushed with clean  
water after each use.  
EMU28871  
Maintenance chart (additional)  
Every  
Item  
Timing belt  
Actions  
Replacement  
500 hours (2.5 years)  
1000 hours (5 years)  
EMU28910  
NOTE:  
When using lead or high-sulfur gasoline, inspecting valve clearance may be required more  
frequently than every 500 hours.  
57  
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Maintenance  
EMU28931  
Greasing  
Yamaha marine grease (Water resistant grease)  
F25MH, F25EH  
ZMU02891  
58  
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Maintenance  
F25ER, F25TR, T25TR  
ZMU02827  
Yamaha dealer. You should periodically re-  
move 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 re-  
place the spark plug with another of the cor-  
rect type.  
EMU28951  
Cleaning and adjusting spark plug  
EWM00560  
WARNING  
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.  
Standard spark plug:  
DPR6EA-9  
The spark plug is an important engine com-  
ponent and is easy to inspect. The condition  
of the spark plug can indicate something  
about the condition of the engine. For exam-  
ple, if the center electrode 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  
Before fitting the spark plug, measure the  
electrode gap with a wire thickness gauge;  
adjust the gap to specification if necessary.  
59  
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Maintenance  
sources of ignition.  
EWM00910  
WARNING  
Leaking fuel can result in fire or explo-  
sion.  
G Check for fuel leakage regularly.  
G 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.  
1. Spark plug gap  
Check the fuel lines for leaks, crack, or mal-  
function. If a problem is found, your Yamaha  
dealer or other qualified mechanic should re-  
pair it immediately.  
2. Spark plug I.D. mark (NGK)  
Spark plug gap:  
0.8–0.9 mm (0.031–0.035 in)  
When fitting the plug, always clean the gas-  
ket 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:  
18.0 Nm (13.3 ft-lb) (1.84 kgf-m)  
NOTE:  
If a torque-wrench is not available when you  
are fitting a spark plug, a good estimate of  
the correct torque is 1/4 to 1/2 a turn past fin-  
ger-tight. Have the spark plug adjusted to the  
correct torque as soon as possible with a  
torque-wrench.  
EMU28962  
Checking fuel system  
EWM00060  
ZMU04969  
WARNING  
Checkpoints  
Gasoline and its vapors are highly flam-  
mable and explosive. Keep away from  
sparks, cigarettes, flames, or other  
G Fuel system parts leakage  
G Fuel line joint leakage  
G Fuel line cracks or other damage  
G Fuel connector leakage  
60  
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Maintenance  
EMU28980  
spilled fuel in a rag.  
Inspecting fuel filter  
3. Remove the filter element, and wash it in  
solvent. Allow it to dry. Inspect the filter  
element and O-ring to make sure they  
are in good condition. Replace them if  
necessary. If any water is found in the  
fuel, the Yamaha portable fuel tank or  
other fuel tanks should be checked and  
cleaned.  
EWM00310  
WARNING  
Gasoline is highly flammable, and its va-  
pors are flammable and explosive.  
G If you have any question about properly  
doing this procedure, consult your  
Yamaha dealer.  
G Do not perform this procedure on a hot  
or running engine. Allow the engine to  
cool.  
G There will be fuel in the fuel filter. Keep  
away from sparks, cigarettes, flames or  
other sources of ignition.  
G This procedure will allow some fuel to  
spill. Catch fuel in a rag. Wipe up any  
spilled fuel immediately.  
G The fuel filter must be reassembled  
carefully with the O-ring, filter cup, and  
hoses in place. Improper assembly or  
replacement could result in a fuel leak,  
which could result in a fire or explosion  
hazard.  
2
3
4
1
ZMU02079  
1. Filter cup  
2. Filter element  
3. Filter housing  
4. O-ring  
EMU29001  
4. Reinstall the filter element in the cup.  
Make sure the O-ring is in position in the  
cup. Firmly screw the cup onto the filter  
housing.  
Cleaning fuel filter  
1. Remove the nut holding the fuel filter as-  
sembly if equipped.  
5. Attach the filter assembly to the bracket  
so that the fuel hoses are attached to the  
filter assembly.  
1
6. Run the engine and check the filter and  
lines for leaks.  
EMU29040  
Inspecting idling speed  
EWM00450  
WARNING  
G Do not touch or remove electrical parts  
when starting or during operation.  
ZMU02309  
1. Nut  
G Keep hands, hair, and clothes away  
from the flywheel and other rotating  
2. Unscrew the filter cup, catching any  
61  
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Maintenance  
EMU29073  
parts while the engine is running.  
G 2-hp models: The propeller rotates  
whenever the engine is running. Do not  
move the throttle control lever from the  
start position during warm-up. The boat  
could unexpectedly start to move,  
which could result in an accident.  
Changing engine oil  
EWM00760  
WARNING  
G Avoid draining the engine oil immedi-  
ately after stopping the engine. The oil  
is hot and should be handled with care  
to avoid burns.  
ECM00490  
G Be sure the outboard motor is securely  
fastened to the transom or a stable  
stand.  
CAUTION:  
This procedure must be performed while  
the outboard motor is in the water. A  
flushing attachment or test tank can be  
used.  
ECM00970  
CAUTION:  
G Do not overfill the oil, and be sure the  
outboard motor is upright (not tilted)  
when checking and changing the en-  
gine oil.  
G If the oil level is above the upper level  
mark, drain until the level meets the  
specified capacity. Overfilling the oil  
could cause leakage or damage.  
A diagnostic tachometer should be used for  
this procedure. Results may vary depending  
on whether testing is conducted with the  
flushing attachment, in a test tank, or with the  
outboard motor in the water.  
1. Start the engine and allow it to warm up  
fully in neutral until it is running smooth-  
ly.  
ECM01240  
2-hp model: Warm the engine with the  
throttle in the start position or less. If the  
outboard is mounted on a boat, be sure  
the boat is tightly moored.  
CAUTION:  
Change the engine oil after the first 10  
hours of operation, and every 100 hours  
or at 6-month intervals thereafter. Other-  
wise the engine will wear quickly.  
NOTE:  
Correct idling speed inspection is only possi-  
ble if the engine is fully warmed up. If not  
warmed up fully, the idle speed will measure  
higher than normal. If you have difficulty ver-  
ifying the idle speed, or the idle speed re-  
quires adjustment, consult a Yamaha dealer  
or other qualified mechanic.  
NOTE:  
Change the engine oil when the oil is still  
warm.  
1. Put the outboard motor in an upright po-  
sition (not tilted).  
2. Verify whether the idle speed is set to  
specification. For idle speed specifica-  
tions, see page 48.  
62  
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Maintenance  
install the drain screw.  
Drain screw tightening torque:  
F25EH 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
F25ER 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
F25MH 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
F25TR 28.0 Nm (20.7 ft-lb) (2.86  
kgf-m)  
T25TR 18.0 Nm (13.3 ft-lb) (1.84  
kgf-m)  
ZMU02831  
2. Prepare a suitable container that holds a  
larger amount than the engine oil capac-  
ity. Loosen and remove the drain screw  
while holding the container under the  
drain hole. Then remove the oil filler cap.  
Let the oil drain completely. Wipe up any  
spilled oil immediately.  
NOTE:  
If a torque wrench is not available when you  
are installing the drain screw, finger tighten  
the screw just until the gasket comes into  
contact with the surface of the drain hole.  
Then tighten 1/4 to 1/2 turn more. Tighten  
the drain screw to the correct torque with a  
torque wrench as soon as possible.  
1
4. Add the correct amount of oil through the  
filler hole. Install the filler cap.  
Recommended engine oil:  
ZMU02310  
4-stroke outboard motor oil  
Engine oil quantity (excluding oil filter):  
F25EH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25ER 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25MH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25TR 1.7 L (1.80 US qt) (1.50 Imp.qt)  
T25TR 1.9 L (2.01 US qt) (1.67 Imp.qt)  
1. Drain screw  
3. Put a new gasket on the oil drain screw.  
Apply a light coat of oil to the gasket and  
63  
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Maintenance  
1
ZMU02058  
ZMU02311  
7. Dispose of used oil according to local  
regulations.  
1. Oil filler cap  
NOTE:  
5. Start the engine and watch to make sure  
the low oil pressure warning indicator (if  
equipped) turns off. Make sure that  
there are no oil leaks.  
ECM00680  
G For more information on the disposal of  
used oil, consult your Yamaha dealer.  
G Change the oil more often when operating  
the engine under adverse conditions such  
as extended trolling.  
CAUTION:  
EMU29111  
If the low oil pressure warning indicator  
does not turn off or if there are oil leaks,  
stop the engine and find the cause. Con-  
tinued operation with a problem could  
cause severe engine damage. Consult  
your Yamaha dealer if the problem can-  
not be located and corrected.  
Checking wiring and connectors  
G Check that each grounding wire is properly  
secured.  
G Check that each connector is engaged se-  
curely.  
6. Turn off the engine and wait 3 minutes.  
Recheck the oil level using the dipstick  
to be sure the level falls between the up-  
per 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.  
ZMU02087  
EMU29120  
Exhaust leakage  
Start the engine and check that no exhaust  
leaks from the joints between the exhaust  
cover, cylinder head, and body cylinder.  
64  
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Maintenance  
EMU29130  
that the trim and tilt rod is pushed out  
completely.  
4. Check that the trim and tilt rod is free of  
corrosion or other flaws.  
5. Tilt the outboard motor down. Check  
that the trim and tilt rod operates  
smoothly.  
Water leakage  
Start the engine and check that no water  
leaks from the joints between the exhaust  
cover, cylinder head, and body cylinder.  
EMU29140  
Engine oil leakage  
Check for oil leaks on the around the engine.  
NOTE:  
NOTE:  
Consult your Yamaha dealer if any operation  
is abnormal.  
If any leaks are found, consult your Yamaha  
dealer.  
EMU29171  
EMU29161  
Checking propeller  
Checking power trim and tilt system  
EWM00321  
EWM00430  
WARNING  
WARNING  
You could be seriously injured if the en-  
gine accidentally starts when you are  
near the propeller.  
G Before inspecting, removing, or install-  
ing the propeller, remove the spark  
plug caps from the spark plugs. Also,  
place the shift control in neutral, turn  
G 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 motor accidentally falls.  
G Make sure no one is under the outboard  
motor before performing this test.  
1. Check the power trim and tilt unit for any  
sign of oil leaks.  
the main switch to “  
” (off) and re-  
move the key, and remove the lanyard  
from the engine stop switch. Turn off  
the battery cut-off switch if your boat  
has one.  
1
G Do not use your hand to hold the pro-  
peller when loosening or tightening the  
propeller nut. Put a wood block be-  
tween the anti-cavitation plate and the  
propeller to prevent the propeller from  
turning.  
ZMU02828  
1. Trim and tilt rod  
2. Operate each of the power trim and tilt  
switches / the power tilt switches on the  
remote control and engine bottom cowl-  
ing (if equipped) to check that all switch-  
es work.  
3. Tilt the outboard motor up and check  
65  
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Maintenance  
NOTE:  
If the shear pin equipped: it is designed to  
break if the propeller hits a hard underwater  
obstacle to help protect the propeller and  
drive mechanism. The propeller will then  
spin freely on the shaft. If this happens, the  
shear pin must be replaced.  
EMU29193  
Removing the propeller  
1. Straighten the cotter pin and pull it out  
using a pair of pliers.  
ZMU02814  
2. Remove the propeller nut, washer, and  
spacer (if equipped).  
ZMU01897  
Checkpoints  
G Check each of the propeller blades for  
wear, erosion from cavitation or ventila-  
tion, or other damage.  
G Check the propeller shaft for damage.  
G Check the splines / shear pin for wear or  
damage.  
1. Cotter pin  
2. Propeller nut  
3. Washer  
4. Spacer  
5. Propeller  
6. Thrust washer  
G Check for fish line tangled around the pro-  
peller shaft.  
1
2
3
4
5
6
ZMU02829  
G Check the propeller shaft oil seal for dam-  
age.  
1. Cotter pin  
66  
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Maintenance  
2. Propeller nut  
3. Washer  
4. Spacer  
5. Propeller  
6. Thrust washer  
3. Remove the propeller and thrust wash-  
er.  
EMU29230  
Installing the propeller  
ZMU02063  
ECM00340  
CAUTION:  
NOTE:  
G Be sure to install the thrust washer be- If the propeller nut does not align with the  
fore installing the propeller, otherwise propeller shaft hole after tightening to the  
the lower case and propeller boss specified torque, tighten the nut further to  
could be damaged.  
align it with the hole.  
G Be sure to use a new cotter pin and  
bend the ends over securely. Otherwise  
the propeller could come off during op-  
eration and be lost.  
EMU29280  
Changing gear oil  
EWM00800  
WARNING  
G Be sure the outboard motor is securely  
fastened to the transom or a stable  
stand. You could be severely injured if  
the outboard motor falls on you.  
G Never get under the lower unit while it  
is tilted, even when the tilt support lever  
or knob is locked. Severe injury could  
occur if the outboard motor accidental-  
ly falls.  
1. Apply Yamaha marine grease or a cor-  
rosion resistant grease to the propeller  
shaft.  
2. Install the spacer(if equipped), thrust  
washer, and propeller on the propeller  
shaft.  
3. Install the spacer (if equipped) and the  
washer. Tighten the propeller nut to the  
specified torque.  
4. Align the propeller nut with the propeller  
shaft hole. Insert a new cotter pin in the  
hole and bend the cotter pin ends.  
1. Tilt the outboard motor so that the gear  
oil drain screw is at the lowest point pos-  
sible.  
2. Place a suitable container under the  
gear case.  
3. Remove the gear oil drain screw.  
67  
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Maintenance  
the gear oil drain screw hole.  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
3
F25EH 320.0 cm (10.82 US oz)  
(11.29 Imp.oz)  
F25ER 320.0 cm (10.82 US oz)  
2
3
(11.29 Imp.oz)  
F25MH 320.0 cm (10.82 US oz)  
1
3
ZMU02323  
(11.29 Imp.oz)  
F25TR 320.0 cm (10.82 US oz)  
(11.29 Imp.oz)  
T25TR 430.0 cm (14.54 US oz)  
1. Gear oil drain screw  
2. Oil level plug  
3
3
NOTE:  
(15.17 Imp.oz)  
If the magnetic gear oil drain screw  
equipped: remove all metal particles from  
the screw before installing it.  
4. Remove the oil level plug to allow the oil  
to drain completely.  
ECM00710  
CAUTION:  
Inspect the used oil after it has been  
drained. If the oil is milky, water is getting  
into the gear case which can cause gear  
damage. Consult a Yamaha dealer for re-  
pair of the lower unit seals.  
ZMU02065  
6. When the oil begins to flow out of the oil  
level plug hole, insert and tighten the oil  
level plug.  
NOTE:  
For disposal of used oil consult your Yamaha  
dealer.  
7. Insert and tighten the gear oil drain  
screw.  
5. With the outboard motor in a vertical po-  
sition, and using a flexible or pressur-  
ized filling device, inject the gear oil into  
EMU29302  
Cleaning fuel tank  
EWM00920  
WARNING  
Gasoline is highly flammable, and its va-  
pors are flammable and explosive.  
G If you have any question about properly  
doing this procedure, consult your  
Yamaha dealer.  
G Keep away from sparks, cigarettes,  
68  
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Maintenance  
flames, or other sources of ignition from the surfaces of the anodes. Consult a  
when cleaning the fuel tank.  
Yamaha dealer for replacement of external  
G Remove the fuel tank from the boat be- anodes.  
ECM00720  
fore cleaning it. Work only outdoors in  
CAUTION:  
Do not paint anodes, as this would render  
them ineffective.  
an area with good ventilation.  
G Wipe up any spilled fuel immediately.  
G Reassemble the fuel tank carefully. Im-  
proper assembly can result in a fuel  
leak, which could result in a fire or ex-  
plosion hazard.  
NOTE:  
Inspect ground leads attached to external  
anodes on equipped models. Consult a  
Yamaha dealer for inspection and replace-  
ment of internal anodes attached to the pow-  
er unit.  
G Dispose of old gasoline according to lo-  
cal regulations.  
1. Empty the fuel tank into an approved  
container.  
2. Pour a small amount of suitable solvent  
into the tank. Install the cap and shake  
the tank. Drain the solvent completely.  
3. Remove the screws holding the fuel joint  
assembly. Pull the assembly out of the  
tank.  
ZMU02325  
ZMU02066  
4. Clean the filter (located on the end of the  
suction pipe) in a suitable cleaning sol-  
vent. Allow the filter to dry.  
ZMU02820  
5. Replace the gasket with a new one. Re-  
install the fuel joint assembly and tighten  
the screws firmly.  
EMU29312  
EMU29320  
Checking battery (for electric start  
models)  
EWM00330  
Inspecting and replacing anode(s)  
Yamaha outboard motors are protected from  
corrosion by sacrificial anodes. Inspect the  
external anodes periodically. Remove scales  
WARNING  
Battery electrolytic fluid is dangerous; it  
contains sulfuric acid and therefore is  
69  
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Maintenance  
poisonous and highly caustic.  
Always follow these preventive mea-  
sures:  
up only with distilled water (or pure de-  
ionized water suitable to use in batter-  
ies).  
G Avoid bodily contact with electrolytic  
fluid as it can cause severe burns or  
permanent eye injury.  
G Wear protective eye gear when han-  
dling or working near batteries.  
Antidote (EXTERNAL):  
G SKIN - Flush with water.  
G EYES - Flush with water for 15 minutes  
and get immediate medical attention.  
Antidote (INTERNAL):  
G 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 hydro-  
gen gas; therefore, you should always  
follow these preventive measures:  
G Charge batteries in a well-ventilated ar-  
ea.  
G Keep batteries away from fire, sparks,  
or open flames (for example: welding  
equipment, lighted cigarettes, and so  
on.)  
2. Always keep the battery 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, re-  
move the battery from the boat and store  
it in a cool, dark place. Completely re-  
charge the battery before using it.  
3. If the battery will be stored for longer  
than a month, check the specific gravity  
of the fluid at least once a month and re-  
charge the battery when it is low.  
NOTE:  
Consult a Yamaha dealer when charging or  
G DO NOT SMOKE when charging or han-  
dling batteries.  
re-charging batteries.  
EMU29331  
KEEP BATTERIES AND ELECTROLYTIC  
FLUID OUT OF REACH OF CHILDREN.  
Connecting the battery  
EWM00570  
ECM00360  
WARNING  
CAUTION:  
G A poorly maintained battery will quickly  
deteriorate.  
G Ordinary tap water contains minerals  
harmful to a battery, and should not be  
used for topping up.  
Mount the battery holder securely in a  
dry, well-ventilated, vibration-free loca-  
tion in the boat. Install a fully charged bat-  
tery in the holder.  
ECM01121  
CAUTION:  
1. Check the electrolyte level at least once G Make sure the main switch (on applica-  
a month. Fill to the manufacturer’s rec-  
ble models) is “  
” (off) before work-  
ommended level when necessary. Top  
70  
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Maintenance  
ing on the battery.  
G Reversal of the battery cables will dam-  
age the electrical parts.  
G Connect the red battery cable first  
when installing the battery and discon-  
nect the black battery cable first when  
removing it. Otherwise, the electrical  
parts can be damaged.  
G The electrical contacts of the battery  
and cables must be clean and properly  
connected, or the battery will not start  
the engine.  
ZMU02068  
EMU29400  
Coating the boat bottom  
A clean hull improves boat performance. The  
boat bottom should be kept as clean of ma-  
rine growth as possible. If necessary, the  
boat bottom can be coated with an anti-foul-  
ing paint approved for your area to inhibit  
marine growth.  
Connect the red battery cable to the POSI-  
TIVE (+) terminal first. Then connect the  
black battery cable to the NEGATIVE (-) ter-  
minal.  
Do not use anti-fouling paint which includes  
copper or graphite. These paints can cause  
more rapid engine corrosion.  
1. Red cable  
2. Black cable  
3. Battery  
ZMU01943  
EMU29370  
Disconnecting the battery  
Disconnect the BLACK cable from the NEG-  
ATIVE (-) terminal first. Then disconnect the  
RED cable from the POSITIVE (+) terminal.  
EMU29390  
Checking top cowling  
Check the fitting of the top cowling by push-  
ing it with both hands. If it is loose have it re-  
paired by your Yamaha dealer.  
71  
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Trouble Recovery  
EMU29422  
A. Fill tank with clean, fresh fuel.  
Troubleshooting  
A problem in the fuel, compression, or igni-  
tion systems can cause poor starting, loss of  
power, or other problems. This section de-  
scribes basic checks and possible remedies,  
and covers all Yamaha outboard motors.  
Therefore some items may not apply to your  
model.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Q. Is starting procedure incorrect?  
A. See page 31.  
Q. Has fuel pump malfunctioned?  
If your outboard motor requires repair, bring  
it to your Yamaha dealer.  
A. Have serviced by a Yamaha dealer.  
If the engine trouble warning indicator is  
flashing, consult your Yamaha dealer.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Starter will not operate.  
Q. Is battery capacity weak or low?  
A. Check battery condition. Use battery of  
recommended capacity.  
Q. Are spark plug cap(s) fitted incorrectly?  
A. Check and re-fit cap(s).  
Q. Are battery connections loose or corrod-  
ed?  
Q. Is ignition wiring damaged or poorly con-  
nected?  
A. Tighten battery cables and clean battery  
terminals.  
A. Check wires for wear or breaks. Tighten  
all loose connections. Replace worn or bro-  
ken wires.  
Q. Is fuse for electric start relay or electric cir-  
cuit blown?  
Q. Are ignition parts faulty?  
A. Check for cause of electric overload and  
repair. Replace fuse with one of correct am-  
perage.  
A. Have serviced by a Yamaha dealer.  
Q. Is engine stop switch lanyard not at-  
tached?  
Q. Are starter components faulty?  
A. Attach lanyard.  
A. Have serviced by a Yamaha dealer.  
Q. Are engine inner parts damaged?  
A. Have serviced by a Yamaha dealer.  
Q. Is shift lever in gear?  
A. Shift to neutral.  
Engine idles irregularly or stalls.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
Engine will not start (starter operates).  
Q. Is fuel tank empty?  
A. Fill tank with clean, fresh fuel.  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Q. Is fuel contaminated or stale?  
72  
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Trouble Recovery  
Q. Is fuel system obstructed?  
A. Return to home position.  
A. Check for pinched or kinked fuel line or  
other obstructions in fuel system.  
Q. Is motor angle too high?  
A. Return to normal operating position.  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
Q. Is carburetor clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Q. Is fuel joint connection incorrect?  
A. Connect correctly.  
Q. Have ignition parts failed?  
A. Have serviced by a Yamaha dealer.  
Q. Is throttle valve adjustment incorrect?  
A. Have serviced by a Yamaha dealer.  
Q. Has warning system activated?  
A. Find and correct cause of warning.  
Q. Is battery cable disconnected?  
A. Connect securely.  
Q. Is spark plug gap incorrect?  
A. Inspect and adjust as specified.  
Warning buzzer sounds or indicator  
lights.  
Q. Is ignition wiring damaged or poorly con- Q. Is cooling system clogged?  
nected?  
A. Check water intake for restriction.  
A. Check wires for wear or breaks. Tighten  
all loose connections. Replace worn or bro- Q. Is engine oil level low?  
ken wires.  
A. Fill oil tank with specified engine oil.  
Q. Is specified engine oil not being used?  
A. Check and replace oil as specified.  
Q. Is heat range of spark plug incorrect?  
A. Inspect spark plug and replace it with rec-  
ommended type.  
Q. Is thermostat faulty or clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is specified engine oil not being used?  
A. Check and replace oil with specified type.  
Q. Are carburetor adjustments incorrect?  
A. Have serviced by a Yamaha dealer.  
Q. Is engine oil contaminated or deteriorat-  
ed?  
Q. Is fuel pump damaged?  
A. Replace oil with fresh, specified type.  
A. Have serviced by a Yamaha dealer.  
Q. Is oil filter clogged?  
Q. Is air vent screw on fuel tank closed?  
A. Open air vent screw.  
A. Have serviced by a Yamaha dealer.  
Q. Has oil feed/injection pump malfunc-  
tioned?  
Q. Is choke knob pulled out?  
73  
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Trouble Recovery  
A. Have serviced by a Yamaha dealer.  
Q. Are weeds or other foreign matter tangled  
on gear housing?  
Q. Is load on boat improperly distributed?  
A. Remove foreign matter and clean lower  
A. Distribute load to place boat on an even unit.  
plane.  
Q. Is fuel system obstructed?  
Q. Is water pump or thermostat faulty?  
A. Have serviced by a Yamaha dealer.  
A. Check for pinched or kinked fuel line or  
other obstructions in fuel system.  
Q. Is there excess water in fuel filter cup?  
A. Drain filter cup.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Engine power loss.  
Q. Is propeller damaged?  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
A. Have propeller repaired or replaced.  
Q. Is spark plug gap incorrect?  
Q. Is propeller pitch or diameter incorrect?  
A. Install correct propeller to operate out-  
A. Inspect and adjust as specified.  
board at its recommended speed (r/min) Q. Is ignition wiring damaged or poorly con-  
range.  
nected?  
A. Check wires for wear or breaks. Tighten  
all loose connections. Replace worn or bro-  
Q. Is trim angle incorrect?  
A. Adjust trim angle to achieve most efficient ken wires.  
operation.  
Q. Have ignition parts failed?  
Q. Is motor mounted at incorrect height on A. Have serviced by a Yamaha dealer.  
transom?  
A. Have motor adjusted to proper transom Q. Is specified engine oil not being used?  
height.  
A. Check and replace oil with specified type.  
Q. Has warning system activated?  
A. Find and correct cause of warning.  
Q. Is thermostat faulty or clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is boat bottom fouled with marine growth? Q. Is air vent screw closed?  
A. Clean boat bottom. A. Open the air vent screw.  
Q. Are spark plug(s) fouled or of incorrect Q. Is fuel pump damaged?  
type?  
A. Have serviced by a Yamaha dealer.  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Q. Is fuel joint connection incorrect?  
A. Connect correctly.  
74  
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Trouble Recovery  
board motor unsafe to operate.  
Q. Is heat range of spark plug incorrect?  
A. Inspect spark plug and replace it with rec-  
ommended type.  
If the outboard motor hits an object in the wa-  
ter, follow the procedure below.  
Q. Is high pressure fuel pump drive belt bro-  
ken?  
A. Have serviced by a Yamaha dealer.  
Q. Is engine not responding properly to shift  
lever position?  
A. Have serviced by a Yamaha dealer.  
Engine vibrates excessively.  
Q. Is propeller damaged?  
A. Have propeller repaired or replaced.  
1. Stop the engine immediately.  
2. Inspect the control system and all com-  
ponents for damage. Also inspect the  
boat for damage.  
3. Whether damage is found or not, return  
to the nearest harbor slowly and careful-  
ly.  
Q. Is propeller shaft damaged?  
A. Have serviced by a Yamaha dealer.  
Q. Are weeds or other foreign matter tangled  
on propeller?  
A. Remove and clean propeller.  
4. Have a Yamaha dealer inspect the out-  
board motor before operating it again.  
EMU29462  
Replacing fuse  
If the fuse has blown on an electric start  
model, open the fuse holder and replace the  
Q. Is motor mounting bolt loose?  
A. Tighten bolt.  
fuse with a new one of the proper amperage.  
Q. Is steering pivot loose or damaged?  
A. Tighten or have serviced by a Yamaha  
dealer.  
EWM00630  
WARNING  
Be sure to use the specified fuse. An in-  
correct fuse or a piece of wire could allow  
excessive current flow. This could cause  
electric system damage and a fire hazard.  
EMU29432  
Temporary action in  
emergency  
EMU29440  
Impact damage  
EWM00870  
WARNING  
The outboard motor can be seriously  
damaged by a collision while operating or  
trailering. Damage could make the out-  
75  
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Trouble Recovery  
EMU29531  
Starter will not operate  
If the starter mechanism does not operate  
(the engine cannot be cranked with the start-  
er), the engine can be started with an emer-  
gency starter rope.  
EWM01020  
2
WARNING  
G Use this procedure only in an emergen-  
cy and only to return to port for repairs.  
G When the emergency starter rope is  
used to start the engine, the start-in-  
gear protection device does not oper-  
ate. Make sure the remote control lever  
is in neutral. Otherwise the boat could  
unexpectedly start to move, which  
could result in an accident.  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
G Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
cord where it could become entangled,  
preventing it from functioning.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
3
1
ZMU02815  
1. Fuse holder  
2. Fuse (20 A)  
3. Spare fuse (20 A)  
NOTE:  
Consult your Yamaha dealer if the new fuse  
immediately blows again.  
EMU29510  
Power trim and tilt will not operate  
If the engine cannot be tilted up or down with  
the power trim and tilt/ the power tilt because  
of a discharged battery or a failure with the  
power trim and tilt unit/the power tilt, the en-  
gine can be tilted manually.  
1. Loosen the manual valve screw by turn-  
ing it clockwise until it stops.  
G Be sure no one is standing behind you  
when pulling the starter rope. It could  
whip behind you and injure someone.  
G 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  
1
ZMU02816  
1. Manual valve screw  
2. Put the engine in the desired position,  
then tighten the manual valve screw by  
turning it counterclockwise.  
76  
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Trouble Recovery  
starter mechanism or top cowling after  
the engine is running.  
G Do not touch the ignition coil, spark  
plug wire, spark plug cap, or other elec-  
trical components when starting or op-  
erating the motor. You could get an  
electrical shock.  
EMU30290  
Emergency starting engine  
1. Remove the top cowling.  
2. Remove the start-in-gear protection ca-  
ble from the starter after removing the  
clip and the screw, if the cable is  
equipped.  
ZMU02649  
4. Prepare the engine for starting. For fur-  
ther information, see page 31. Be sure  
the engine is in neutral and that the en-  
gine stop switch lanyard lock plate is at-  
tached to the engine stop switch. The  
main switch must be “ ” (on), if  
equipped.  
ZMU02337  
3. Remove the starter/flywheel cover after  
removing the 4 bolts. Disconnect the  
leads for the warning indicator.  
ZMU02026  
ZMU02338  
ZMU02334  
77  
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Trouble Recovery  
EMU29783  
Procedure  
ON  
1. Thoroughly wash away mud, salt, sea-  
weed, and so on, with fresh water.  
2. Remove the spark plug(s), then face the  
spark plug holes downward to allow any  
water, mud, or contaminants to drain.  
3. Drain the fuel from the carburetor, fuel  
filter, and fuel line. Drain the engine oil  
completely.  
OFF  
ZMU01880  
4. Fill the sump with the fresh engine oil.  
5. Insert the knotted end of the emergency  
starter rope into the notch in the flywheel  
rotor and wind the rope around the fly-  
wheel 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 neces-  
sary.  
Engine oil capacity:  
F25EH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25ER 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25MH 1.7 L (1.80 US qt) (1.50 Imp.qt)  
F25TR 1.7 L (1.80 US qt) (1.50 Imp.qt)  
T25TR 1.9 L (2.01 US qt) (1.67 Imp.qt)  
5. Feed engine fogging oil or engine oil  
through the carburetor(s) and spark plug  
holes 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.  
ECM00400  
CAUTION:  
Do not attempt to run the outboard motor  
until it has been completely inspected.  
ZMU02339  
EMU29760  
Treatment of submerged motor  
If the outboard motor is submerged, immedi-  
ately take it to a Yamaha dealer. Otherwise  
some corrosion may begin almost immedi-  
ately.  
If you cannot immediately take the outboard  
motor to a Yamaha dealer, follow the proce-  
dure below in order to minimize engine dam-  
age.  
78  
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Consumer information  
EMU29811  
Important warranty information for U.S.A. and Canada  
79  
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Consumer information  
80  
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Consumer information  
EMU29830  
YAMAHA MOTOR CORPORATION, U.S.A.  
FOUR-STROKE OUTBOARD MOTOR  
THREE-YEAR LIMITED WARRANTY  
81  
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Consumer information  
82  
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Consumer information  
EMU29840  
IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR  
YAMAHA OUTSIDE U.S.A. OR CANADA  
83  
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Printed in Japan  
April 2004–0.9 × 1 !  
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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