05/04/12 20:08:50 32Z5N600_001
INTRODUCTION
Thank you for purchasing a Honda engine. We want to help you to
get the best results from your new engine and to operate it safely.
This m anual contains inform ation on how to do that; please read it
carefully before operating the engine. If a problem should arise, or
if you have any questions about your engine, consult an
authorized Honda servicing dealer.
OWNER’S MANUAL
MANUEL DE L’UTILISATEUR
MANUAL DEL PROPIETARIO
All inform ation in this publication is based on the latest product
inform ation available at the tim e of printing. Honda Motor Co., Ltd.
reserves the right to m ake changes at any tim e without notice and
without incurring any obligation. No part of this publication m ay
be reproduced without written perm ission.
GXV340 · GXV390
This m anual should be considered a perm anent part of the engine
and should rem ain with the engine if resold.
Review the instructions provided with the equipm ent powered by
this engine for any additional inform ation regarding engine
startup, shutdown, operation, adjustm ents or any special
m aintenance instructions.
United States, Puerto Rico, and U.S. Virgin Islands:
We suggest you read the warranty policy to fully understand its
coverage and your responsibilities of ownership. The warranty
policy is a separate docum ent that should have been given to you
by your dealer.
The engine exhaust from this product
contains chem icals known to the State of
California to cause cancer, birth defects
or other reproductive harm .
SAFETY MESSAGES
Your safety and the safety of others is very im portant. We have
provided im portant safety m essages in this m anual and on the
engine. Please read these m essages carefully.
CONTENTS
INTRODUCTION........................1
SAFETY MESSAGES .................1
SAFETY INFORMATION ...........2 HELPFUL TIPS &
SPARK PLUG .......................10
SPARK ARRESTER ..............11
A safety m essage alerts you to potential hazards that could hurt
you or others. Each safety m essage is preceded by a safety alert
sym bol
and one of three words, DANGER, WARNING, or
SAFETY LABEL LOCATION ......2 SUGGESTIONS .......................11
CAUTION.
COMPONENT & CONTROL
LOCATION .................................2
STORING YOUR ENGINE....11
TRANSPORTING .................13
These signal words m ean:
FEATURES .................................3 TAKING CARE OF
You WILL be KILLED or SERIOUSLY
HURT if you don’t follow instructions.
BEFORE OPERATION
CHECKS .....................................3 TECHNICAL & CONSUMER
OPERATION...............................4 INFORMATION........................14
UNEXPECTED PROBLEMS .....13
You CAN be KILLED or SERIOUSLY
HURT if you don’t follow instructions.
SAFE OPERATING
Serial Num ber Location ......14
Battery Connections for
PRECAUTIONS ......................4
STARTING THE ENGINE .......4
STOPPING THE ENGINE .......5
SETTING ENGINE SPEED......6
SERVICING YOUR ENGINE ......7
THE IMPORTANCE OF
MAINTENANCE .....................7
MAINTENANCE SAFETY.......7
SAFETY PRECAUTIONS ........7
MAINTENANCE
Electric Starter .....................14
Rem ote Control Linkage......14
Carburetor Modifications for
High Altitude Operation ......14
Oxygenated Fuels................15
Em ission Control System
Inform ation ..........................15
Air Index...............................16
Specifications ......................16
Tuneup Specifications.........16
Quick Reference
You CAN be HURT if you don’t follow
instructions.
Each m essage tells you what the hazard is, what can happen, and
what you can do to avoid or reduce injury.
DAMAGE PREVENTION MESSAGES
You will also see other im portant m essages that are preceded by
the word NOTICE.
SCHEDULE.............................7
REFUELING............................8
ENGINE OIL............................8
Recom m ended Oil .............8
Inform ation ..........................17
Wiring Diagram s .................17
This word m eans:
Your engine or other property can be dam aged if you
don’t follow instructions.
Oil Level Check...................9 CONSUMER INFORMATION..18
Oil Change ..........................9
AIR CLEANER.......................10
Inspection .........................10
Cleaning ...........................10
Distributor/Dealer Locator
Inform ation ..........................18
Custom er Service
The purpose of these m essages is to help prevent dam age to your
engine, other property, or the environm ent.
Inform ation ..........................18
2005 Honda Motor Co., Ltd. －All Rights Reserved
GXV340UT2·GXV390UT1
32Z5N600
00X32-Z5N-6000
ENGLISH
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FEATURES
BEFORE OPERATION CHECKS
OIL ALERT SYSTEM (applicable types)
IS YOUR ENGINE READY TO GO?
The Oil Alert system is designed to prevent engine dam age
caused by an insufficient am ount of oil in the crankcase. Before
the oil level in the crankcase can fall below a safe lim it, the Oil
For your safety, and to m axim ize the service life of your
equipm ent, it is very im portant to take a few m om ents before you
Alert system will sound a buzzer, warning you that oil needs to be operate the engine to check its condition. Be sure to take care of
added to the engine.
any problem you find, or have your servicing dealer correct it,
before you operate the engine.
The Oil Alert system is not designed to be used in place of
checking the oil. Check the oil level prior to each use.
The ‘‘Oil Alert ’’ buzzer will arm you when engine oil needs to be
added to the crankcase. If the buzzer sounds, stop the engine and
add oil (see page 9 ).
Im properly m aintaining this engine, or failure to
correct a problem before operation, can cause a
m alfunction in which you can be seriously hurt or
killed.
The buzzer indicates insufficient oil. Running the engine with
insufficient oil can cause serious engine dam age.
Always perform a preoperation inspection before
each operation, and correct any problem .
Before beginning your preoperation checks, be sure the engine is
level and the engine switch is in the OFF position.
Always check the following item s before you start the engine:
Check the General Condition of the Engine
1. Look around and underneath the engine for signs of oil or
gasoline leaks.
2. Rem ove any excessive dirt or debris, especially around the
m uffler and recoil starter.
3. Look for signs of dam age.
4. Check that all shields and covers are in place, and all nuts, bolts,
and screws are tightened.
Check the Engine
1. Check the fuel level (see page 8 ). Starting with a full tank will
help to elim inate or reduce operating interruptions for refueling.
2. Check the engine oil level (see page 9 ). Running the engine
with a low oil level can cause engine dam age.
The ‘‘Oil Alert ’’ buzzer (applicable types) will warn you when
engine oil needs to be added to the crankcase. If the buzzer
sounds, stop the engine and add oil.
3. Check the air filter elem ent (see page 10 ). A dirty air filter
elem ent will restrict air flow to the carburetor, reducing engine
perform ance.
4. Check the equipm ent powered by this engine.
Review the instructions provided with the equipm ent powered
by this engine for any precautions and procedures that should
be followed before engine startup.
ENGLISH
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OPERATION
STARTING THE ENGINE
SAFE OPERATING PRECAUTIONS
1. Move the fuel valve lever to the ON position.
FUEL VALVE LEVER
Before operating the engine for the first tim e, please review the
SAFETY INFORMATION section on page 2 and the BEFORE
OPERATION CHECKS on page 3 .
ON
Carbon m onoxide gas is toxic. Breathing it can cause
unconsciousness and even kill you.
Avoid any areas or actions that expose you to carbon
m onoxide.
Review the instructions provided with the equipm ent powered by
this engine for any safety precautions that should be observed
with engine startup, shutdown or operation.
2. To start a cold engine, m ove the control lever to the CHOKE
position.
CONTROL LEVER
Control Lever
The control lever operates the engine switch, throttle, and choke.
CHOKE
MAX.
OFF––––––––Stop the engine by switching off the ignition system .
All other control lever positions leave the ignition
system switched on.
MIN. –––––––For running the engine at idle speed.
MAX. ––––––For restarting a warm engine, and for running the
engine at m axinum speed.
CHOKE–––––Enriches the fuel m ixture for starting a cold engine.
To restart a warm engine, leave the control lever in the MAX.
position.
The control lever shown here will be connected to a rem ote
control on the equipm ent powered by this engine. Refer to the
instructions provided with that equipm ent for rem ote control
inform ation.
The control lever shown here will be connected to a rem ote
control on the equipm ent powered by this engine. Refer to the
instructions provided with that equipm ent for rem ote control
inform ation.
3. Turn the engine switch to the ON position.
CHOKE
MAX.
There m ay be a rem ote engine switch m ounted on the
equipm ent powered by this engine. Refer to the instructions
provided with the equipm ent for rem ote control inform ation.
MIN.
OFF
CONTROL LEVER
4
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05/04/12 20:10:02 32Z5N600_005
4. Operate the starter.
RECOIL STARTER
STOPPING THE ENGINE
To stop the engine in an em ergency, sim ply m ove the control
lever to the OFF position. Under norm al conditions, use the
following procedure.
Pull the starter grip lightly until you feel resistance, then pull
briskly. Return the starter grip gently.
1. Move the control lever to the OFF position.
STARTER GRIP
The control lever shown here will be connected to a rem ote
control on the equipm ent powered by this engine. Refer to the
instructions provided with the equipm ent for rem ote control
inform ation.
CONTROL LEVER
OFF
Do not allow the starter grip to snap back against the engine.
Return it gently to prevent dam age to the starter.
ELECTRIC STARTER (applicable types):
2. Turn the engine switch to the OFF position.
The electric starter will be connected to a rem ote control on the
equipm ent powered by this engine. Refer to the instructions
provided with the equipm ent for rem ote control inform ation.
There m ay be a rem ote engine switch m ounted on the
equipm ent powered by this engine. Refer to the instructions
provided with the equipm ent for rem ote control inform ation.
Turn the engine switch key to the START position, and hold it
there until the engine starts.
3. Turn the fuel valve lever to the OFF position.
If the engine fails to start within 5 seconds, release the engine
switch key, and wait at least 10 seconds before operating the
starter again.
FUEL VALVE LEVER
Using the electric starter for m ore than 5 seconds at a tim e will
overheat the starter m otor and can dam age it.
When the engine starts, release the engine switch key, allowing
it to return to the ON position.
OFF
5. If the control lever was m oved to the CHOKE position to start the
engine, gradually m ove it to the MAX. or MIN. position as the
engine warm s up.
The control lever shown here will be connected to a rem ote
control on the equipm ent powered by this engine. Refer to the
instructions provided with that equipm ent for rem ote control
inform ation.
CONTROL LEVER
MAX.
MIN.
ENGLISH
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SETTING ENGINE SPEED
Position the control lever for the desired engine speed.
The control lever shown here will be connected to a rem ote
control on the equipm ent powered by this engine. Refer to the
instructions provided with that equipm ent for rem ote control
inform ation and engine speed recom m endations.
CONTROL LEVER
MAX.
MIN.
6
ENGLISH
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SERVICING YOUR ENGINE
MAINTENANCE SCHEDULE
THE IMPORTANCE OF MAINTENANCE
Good m aintenance is essential for safe, econom ical and trouble-
free operation. It will also help reduce pollution.
REGULAR SERVICE PERIOD (3)
Perform at every
Each
Use
First Every 3 Every 6 Every Refer
Month Months Months Year
or or or or
to
indicated m onth or
operating hour interval,
whichever com es first.
ITEM
Page
20 Hrs 50 Hrs 100 Hrs 300 Hrs
Im proper m aintenance, or failure to correct a
problem before operation, can cause a m alfunction in
which you can be seriously hurt or killed.
Engine oil
Check level
Change
Check
9
9
Air filter
10
Clean
(1)
Always follow the inspection and m aintenance
recom m endations and schedules in this owner’s
m anual.
Replace
Check-adjust
Replace
Clean
＊
Spark plug
10
11
Spark arrester
To help you properly care for your engine, the following pages
include a m aintenance schedule, routine inspection procedures,
and sim ple m aintenance procedures using basic hand tools. Other
service tasks that are m ore difficult, or require special tools, are
best handled by professionals and are norm ally perform ed by a
Honda technician or other qualified m echanic.
(
applicable types
)
Idle speed
Check-adjust
Check-adjust
Clean
(2) Shop
m anual
(2) Shop
m anual
Shop
Valve clearance
Com bustion
cham ber
Fuel tank &
filter
After every 250 Hrs. (2)
m anual
(2) Shop
m anual
Shop
The m aintenance schedule applies to norm al operating conditions.
If you operate your engine under severe conditions, such as
sustained high-load or high-tem perature operation, or use in
unusually wet or dusty conditions, consult your servicing dealer
for recom m endations applicable to your individual needs and use.
Clean
Fuel tube
Check
Every 2 years
(Replace if necessary) (2)
m anual
＊ Replace paper elem ent type only.
Maintenance, replacement, or repair of the emission control
devices and systems may be performed by any engine repair
establishment or individual, using parts that are ‘‘certified’’ to
EPA standards.
(1) Service m ore frequently when used in dusty areas.
(2) These item s should be serviced by your servicing dealer,
unless you have the proper tools and are m echanically
proficient. Refer to Honda shop m anual for service procedures.
MAINTENANCE SAFETY
Som e of the m ost im portant safety precautions follow. However,
we cannot warn you of every conceivable hazard that can arise in
perform ing m aintenance. Only you can decide whether or not you
should perform a given task.
(3) For com m ercial use, log hours of operation to determ ine
proper m aintenance intervals.
Failure to follow this m aintenance schedule could result in non-
warrantable failures.
Failure to properly follow m aintenance instructions
and precautions can cause you to be seriously hurt or
killed.
Always follow the procedures and precautions in this
owner’s m anual.
SAFETY PRECAUTIONS
Make sure the engine is off before you begin any m aintenance
or repairs. This will elim inate several potential hazards:
－Carbon monoxide poisoning from engine exhaust.
Be sure there is adequate ventilation whenever you operate
the engine.
－Burns from hot parts.
Let the engine and exhaust system cool before touching.
－Injury from moving parts.
Do not run the engine unless instructed to do so.
Read the instructions before you begin, and m ake sure you have
the tools and skills required.
To reduce the possibility of fire or explosion, be careful when
working around gasoline. Use only a nonflam m able solvent, not
gasoline, to clean parts. Keep cigarettes, sparks and flam es
away from all fuel related parts.
Rem em ber that an authorized Honda servicing dealer knows your
engine best and is fully equipped to m aintain and repair it.
To ensure the best quality and reliability, use only new genuine
Honda parts or their equivalents for repair and replacem ent.
ENGLISH
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REFUELING
Refuel in a well-ventilated area before starting the engine. If the
engine has been running, allow it to cool. Refuel carefully to avoid
spilling fuel. Do not fill the fuel tank com pletely. Fill tank to the
upper lim it level below the filler neck of the fuel tank to allow for
fuel expansion. It m ay be necessary to lower the fuel level
depending on operating conditions. After refueling, tighten the
fuel filler cap securely.
Recommended Fuel
Unleaded gasoline
U.S.
Except U.S.
Pum p octane rating 86 or higher
Research octane rating 91 or higher
Pum p octane rating 86 or higher
This engine is certified to operate on unleaded gasoline. Unleaded Never refuel the engine inside a building where gasoline fum es
gasoline produces fewer engine and spark plug deposits and
extends exhaust system life.
m ay reach flam es or sparks. Keep gasoline away from appliance
pilot lights, barbecues, electric appliances, power tools, etc.
Spilled fuel is not only a fire hazard, it causes environm ental
dam age. Wipe up spills im m ediately.
Gasoline is highly flam m able and explosive, and you
can be burned or seriously injured when refueling.
Stop engine and keep heat, sparks, and flam e away.
Refuel only outdoors.
For inform ation regarding oxygenated fuels, please refer to page
15 .
Wipe up spills im m ediately.
ENGINE OIL
Oil is a m ajor factor affecting perform ance and service life. Use
4-stroke autom otive detergent oil.
SAE Viscosity Grades
Fuel can dam age paint and som e types of plastic. Be careful not to Recommended Oil
spill fuel when filling your fuel tank. Dam age caused by spilled
fuel is not covered under the Distributor’s Lim ited Warranty.
Use 4-stroke m otor oil that
m eets or exceeds the
Never use stale or contam inated gasoline or oil/gasoline m ixture.
Avoid getting dirt or water in the fuel tank.
requirem ents for API service
classification SJ , SL, or
equivalent. Always check the
API service label on the oil
Occasionally you m ay hear a light ‘‘spark knock’’ or ‘‘pinging’’
(m etallic rapping noise) while operating under heavy loads. This is container to be sure it includes
AMBIENT TEMPERATURE
no cause for concern.
the letters SJ , SL, or equivalent.
If spark knock or pinging occurs at a steady engine speed, under
norm al load, change brands of gasoline. If spark knock or pinging
persists, see an authorized Honda servicing dealer.
SAE 10W-30 is recom m ended for general use. Other viscosities
shown in the chart m ay be used when the average tem perature in
your area is within the indicated range.
Running the engine with persistent spark knock or pinging can
cause engine dam age.
Running the engine with persistent spark knock or pinging is
considered m isuse, and the Distributor’s Lim ited Warranty does
not cover parts dam aged by m isuse.
1. With the engine stopped and on a level surface, rem ove the fuel
filler cap and check the fuel level.
2. Refill the tank if the fuel level is low. Do not fill above the upper
lim it of the fuel tank. Wipe up spilled fuel before starting the
engine.
FILLER NECK
FUEL FILLER CAP
UPPER LIMIT
8
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05/04/12 20:11:02 32Z5N600_009
Oil Level Check
4. Screw in the oil filler cap/dipstick securely.
Check the engine oil level with the engine stopped and in a level
position.
OIL FILLER CAP/DIPSTICK
1. Rem ove the oil filler cap/dipstick and wipe it clean.
2. Insert and rem ove the oil filler cap/dipstick without screwing it
into the oil filler neck. Check the oil level shown on the dipstick.
3. If the oil level is near or below the lower lim it m ark on the
dipstick, fill with the recom m ended oil (see page 8 ) to the upper
lim it m ark. Do not overfill.
SEALING
WASHER
UPPER
LIMIT
OIL DRAIN
PLUG
4. Screw in the filler cap/dipstick securely.
LOWER
LIMIT
OIL FILLER CAP/
DIPSTICK
OIL FILLER NECK
UPPER LIMIT
LOWER LIMIT
Running the engine with a low oil level can cause engine dam age.
The ‘‘Oil Alert ’’ buzzer (applicable types) will warn you when
engine oil needs to be added to the crankcase. If the buzzer sounds,
stop the engine and add oil.
Oil Change
Drain the used oil when the engine is warm . Warm oil drains
quickly and com pletely.
1. Place a suitable container below the engine to catch the used oil,
then rem ove the oil filler cap/dipstick, oil drain plug and washer.
2. Allow the used oil to drain com pletely, then reinstall the oil drain
plug and new washer, and tighten the oil drain plug securely.
Please dispose of used m otor oil in a m anner that is com patible
with the environm ent. We suggest you take used oil in a sealed
container to your local recycling center or service station for
reclam ation. Do not throw it in the trash, pour it on the ground,
or down a drain.
3. With the engine in a level position, fill to the upper lim it m ark on
the dipstick with the recom m ended oil (see page 8 ).
Running the engine with a low oil level can cause engine
dam age.
The ‘‘Oil Alert ’’ buzzer (applicable types) will warn you when
engine oil needs to be added to the crankcase. If the buzzer sounds,
stop the engine and add oil.
ENGLISH
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AIR CLEANER
SPARK PLUG
A dirty air cleaner will restrict air flow to the carburetor, reducing
engine perform ance. If you operate the engine in very dusty areas,
clean the air filter m ore often than specified in the MAINTENANCE
SCHEDULE.
Recommended Spark Plugs: BPR5ES (NGK)
W16EPR-U (DENSO)
The recom m ended spark plug is the correct heat range for norm al
engine operating tem peratures.
Operating the engine without an air filter, or with a dam aged air
filter, will allow dirt to enter the engine, causing rapid engine wear. An incorrect spark plug can cause engine dam age.
This type of dam age is not covered by the Distributor’s Lim ited
Warranty.
For good perform ance, the spark plug m ust be properly gapped
and free of deposits.
Inspection
SPARK PLUG CAP
1. Disconnect the spark plug cap,
and rem ove any dirt from
around the spark plug area.
SPARK PLUG WRENCH
Rem ove the air cleaner cover and inspect the filter elem ents.
Clean or replace dirty filter elem ents. Always replace dam aged
filter elem ents.
2. Rem ove the spark plug with a
13/16-inch spark plug wrench.
WING NUT
Cleaning
1. Rem ove the wing nut from
the air cleaner cover, and
rem ove the cover.
3. Inspect the spark plug.
Replace it if dam aged, badly
fouled, if the sealing washer
is in poor condition, or if the
electrode is worn.
AIR CLEANER
COVER
PAPER AIR
FILTER
ELEMENT
2. Rem ove the air filter
elem ents.
SIDE ELECTRODE
0.70－0.80 mm
4. Measure the spark plug
electrode gap with a wire-
type feeler gauge. Correct the
gap, if necessary, by carefully
bending the side electrode.
The gap should be:
(0.028－0.031 in)
3. Rem ove the foam air filter
elem ent from the paper air
filter elem ent.
FOAM AIR
FILTER
ELEMENT
SEALING
WASHER
4. Inspect both air filter
elem ents, and replace them if
they are dam aged. Always
replace the paper air filter
elem ent at the scheduled
interval (see page 7 ).
0.70－0.80 m m (0.028－0.031 in)
5. Install the spark plug carefully,
by hand, to avoid cross-
threading.
AIR CLEANER
BASE
5. Clean the air filter elem ents if they are to be reused.
6. After the spark plug is seated, tighten with a 13/16-inch spark
plug wrench to com press the sealing washer.
Paper air filter elem ent: Tap the filter elem ent several tim es on a
hard surface to rem ove dirt, or blow com pressed air [not
exceeding 207 kPa (2.1 kgf/cm , 30 psi)] through the filter
elem ent from the inside. Never try to brush off dirt; brushing will
force dirt into the fibers.
7. When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to com press the washer.
8. When reinstalling the original spark plug, tighten 1/8－1/4 turn
after the spark plug seats to com press the washer.
Foam air filter elem ent: Clean in warm soapy water, rinse, and
allow to dry thoroughly. Or clean in nonflam m able solvent and
allow to dry. Dip the filter elem ent in clean engine oil, then
squeeze out all excess oil. The engine will sm oke when started if
too m uch oil is left in the foam .
A loose spark plug can overheat and dam age the engine.
Overtightening the spark plug can dam age the threads in the
cylinder head.
6. Wipe dirt from the inside of the air cleaner base and cover, using 9. Attach the spark plug cap to the spark plug.
a m oist rag. Be careful to prevent dirt from entering the air duct
that leads to the carburetor.
7. Place the foam air filter elem ent over the paper elem ent, and
reinstall the assem bled air filter.
8. Install the air cleaner cover, and tighten the wing nut securely.
10
ENGLISH
05/04/18 14:40:50 32Z5N600_011
SPARK ARRESTER (applicable types)
HELPFUL TIPS & SUGGESTIONS
The spark arrester m ay be standard or an optional part, depending STORING YOUR ENGINE
on the engine type. In som e areas, it is illegal to operate an engine
without a spark arrester. Check local laws and regulations. A spark Storage Preparation
arrester is available from authorized Honda servicing dealers.
Proper storage preparation is essential for keeping your engine
trouble-free and looking good. The following steps will help to
keep rust and corrosion from im pairing your engine’s function and
appearance, and will m ake the engine easier to start when you use
it again.
The spark arrester m ust be serviced every 100 hours to keep it
functioning as designed.
If the engine has been running, the m uffler will be hot. Allow it to
cool before servicing the spark arrester.
Cleaning
If the engine has been running, allow it to cool for at least half an
hour before cleaning. Clean all exterior surfaces, touch up any
dam aged paint, and coat other areas that m ay rust with a light film
of oil.
Spark Arrester Removal
1. Rem ove the three 5 m m screws from the m uffler protector.
2. Rem ove the 8 m m bolt and the two 8 m m nuts, and rem ove the
m uffler protector, identification plate, m uffler and gasket from
the cylinder.
Using a garden hose or pressure washing equipm ent can force
water into the air cleaner or m uffler opening. Water in the air
cleaner will soak the air filter, and water that passes through the
air filter or m uffler can enter the cylinder, causing dam age.
3. Rem ove the spark arrester from the m uffler (take care not to
dam age the wire m esh).
Fuel
Gasoline will oxidize and deteriorate in storage. Deteriorated
gasoline will cause hard starting, and it leaves gum deposits that
clog the fuel system . If the gasoline in your engine deteriorates
during storage, you m ay need to have the carburetor, and other
fuel system com ponents, serviced or replaced.
MUFFLER
MUFFLER PROTECTOR
5 mm SCREW (3)
The length of tim e that gasoline can be left in your fuel tank and
carburetor without causing functional problem s will vary with
such factors as gasoline blend, your storage tem peratures, and
whether the fuel tank is partially or com pletely filled. The air in a
partially filled fuel tank prom otes fuel deterioration. Very warm
storage tem peratures accelerate fuel deterioration. Fuel problem s
m ay occur within a few m onths, or even less if the gasoline was
not fresh when you filled the fuel tank.
GASKET
SPARK ARRESTER
8 mm BOLT
IDENTIFICATION PLATE
8 mm NUT (2)
Fuel system dam age or engine perform ance problem s resulting
from neglected storage preparation are not covered under the
Distributor’s Lim ited Warranty.
Spark Arrester Cleaning & Inspection
1. Use a brush to rem ove carbon
deposits from the spark arrester
screen. Be careful not to dam age
the screen. Replace the spark
arrester if it has breaks or holes.
You can extend fuel storage life by adding a gasoline stabilizer
that is form ulated for that purpose, or you can avoid fuel
deterioration problem s by draining the fuel tank and carburetor.
SPARK ARRESTER
SCREEN
2. Install the gasket, spark arrester, m uffler, identification plate,
and m uffler protector in reverse order of rem oval.
ENGLISH
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05/04/12 20:12:06 32Z5N600_012
Adding a Gasoline Stabilizer to Extend Fuel Storage Life
Engine Oil
When adding a gasoline stabilizer, fill the fuel tank with fresh
gasoline. If only partially filled, air in the tank will prom ote fuel
deterioration during storage. If you keep a container of gasoline
for refueling, be sure that it contains only fresh gasoline.
1. Change the engine oil (see page 9 ).
2. Rem ove the spark plug (see page 10 ).
3. Pour a tablespoon 5－10 cm (5－10 cc) of clean engine oil into
the cylinder.
1. Add gasoline stabilizer following the m anufacturer’s instructions.
2. After adding a gasoline stabilizer, run the engine outdoors for 10 4. Pull the starter rope several tim es to distribute the oil in the
m inutes to be sure that treated gasoline has replaced the
untreated gasoline in the carburetor.
cylinder.
5. Reinstall the spark plug.
3. Stop the engine, and m ove the fuel valve lever to the OFF
position.
6. Pull the starter rope slowly until resistance is felt.
(At this tim e the index m ark on the cooling fan aligns with the
index m ark on the fan cover).
FUEL VALVE LEVER
This will close the valves so m oisture cannot enter the engine
cylinder. Return the starter rope gently.
INDEX MARKS
COOLING FAN
OFF
Draining the Fuel Tank and Carburetor
FAN COVER
Storage Precautions
If your engine will be stored with gasoline in the fuel tank and
carburetor, it is im portant to reduce the hazard of gasoline vapor
ignition. Select a well-ventilated storage area away from any
appliance that operates with a flam e, such as a furnace, water
heater, or clothes dryer. Also avoid any area with a spark-
producing electric m otor, or where power tools are operated.
Gasoline is highly flam m able and explosive, and you
can be burned or seriously injured when handling
fuel.
Stop engine and keep heat, sparks, and flam e away.
Handle fuel only outdoors.
Wipe up spills im m ediately.
If possible, avoid storage areas with high hum idity, because that
prom otes rust and corrosion.
1. Place an approved gasoline container below the carburetor, and
use a funnel to avoid spilling fuel.
Unless all fuel has been drained from the fuel tank, leave the fuel
valve lever in the OFF position to reduce the possibility of fuel
2. Rem ove the drain bolt and gasket, and drain the carburetor bowl leakage.
fuel into an approved gasoline container.
Position the equipm ent so the engine is level. Tilting can cause
3. Move the fuel valve lever to the ON position. This will allow the
fuel tank to drain through the carburetor bowl.
fuel or oil leakage.
With the engine and exhaust system cool, cover the engine to
keep out dust. A hot engine and exhaust system can ignite or m elt
som e m aterials. Do not use sheet plastic as a dust cover. A
nonporous cover will trap m oisture around the engine, prom oting
rust and corrosion.
FUEL VALVE LEVER
ON
GASKET
If equipped with a battery for electric starter types, recharge the
battery once a m onth while the engine is in storage.
This will help to extend the service life of the battery.
DRAIN BOLT
CARBURETOR BOWL
4. After draining the carburetor bowl and fuel tank, install the drain
bolt and gasket and tighten securely.
12
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05/04/12 20:12:20 32Z5N600_013
Removal from Storage
Check your engine as described in the BEFORE OPERATION
TAKING CARE OF UNEXPECTED PROBLEMS
CHECKS section of this m anual (see page 3 ).
ENGINE WILL
NOT START
1. Electric
starting
(applicable
types):
Possible Cause
Correction
If the fuel was drained during storage preparation, fill the tank with
fresh gasoline. If you keep a container of gasoline for refueling, be
sure it contains only fresh gasoline. Gasoline oxidizes and
deteriorates over tim e, causing hard starting.
Battery
discharged.
Recharge battery.
Fuse burnt out.
Replace fuse.
Check battery
and fuse.
2. Check control
positions.
If the cylinder was coated with oil during storage preparation, the
engine will sm oke briefly at startup. This is norm al.
Fuel valve OFF.
Choke open.
Move lever to ON
position.
Move control lever
to CHOKE position
unless the engine
is warm .
Turn engine switch
to ON position or
m ove the throttle
control away from
the OFF position.
Fill with the
recom m ended oil
to the proper level
(p. 9).
TRANSPORTING
If the engine has been running, allow it to cool for at least 15
m inutes before loading the engine-powered equipm ent on the
transport vehicle. A hot engine and exhaust system can burn you
and can ignite som e m aterials.
Engine switch
OFF. (if
equipped)
Keep the engine level when transporting to reduce the possibility
of fuel leakage. Turn the fuel valve to the OFF position (see
page 5 ).
3. Check engine
oil level.
Engine oil level
low (Oil Alert
types).
4. Check fuel.
Out of fuel.
Refuel (p. 8).
Bad fuel; engine
stored without
treating or
Drain fuel tank and
carburetor (p.12 ).
Refuel with fresh
gasoline (p. 8 ).
draining
gasoline, or
refueled with
bad gasoline.
Spark plug faulty,
fouled, or
5. Rem ove and
inspect spark
plug.
Gap or replace
spark plug (p.10 ).
im properly
gapped.
Spark plug wet
with fuel
(flooded engine).
Dry and reinstall
spark plug. Start
engine with control
lever in MAX.
position.
6. Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
Fuel filter
restricted,
Replace or repair
faulty com ponents
as necessary.
carburetor
m alfunction,
ignition
m alfunction,
valves stuck, etc.
m anual.
ENGINE LACKS
POWER
Possible Cause
Correction
1. Check air filter.
Filter elem ent(s)
restricted.
Clean or replace
filter elem ent(s)
(p.10 ).
2. Check fuel.
Bad fuel; engine
stored without
treating or
Drain fuel tank and
carburetor (p.10 ).
Refuel with fresh
gasoline (p. 8 ).
draining
gasoline, or
refueled with
bad gasoline.
Fuel filter
restricted,
carburetor
3. Take engine to
an authorized
Honda
Replace or repair
faulty com ponents
as necessary.
servicing
dealer, or refer
to shop
m alfunction,
ignition
m alfunction,
valves stuck, etc.
m anual.
ENGLISH
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05/04/12 20:12:37 32Z5N600_014
TECHNICAL & CONSUMER INFORMATION
Remote Control Linkage
TECHNICAL INFORMATION
The control is provided with a hole for cable attachm ent. Install a
solid wire cable as shown below. Do not use braided wire cable.
Serial Number Location
Record the engine serial
num ber, type and purchase
date in the space below. You
will need this inform ation when
ordering parts and when
m aking technical or warranty
inquiries.
SOLID WIRE CABLE
CABLE CLAMP
5 × 16mm BOLT
ENGINE SERIAL NUMBER &
ENGINE TYPE LOCATION
Engine serial num ber: __ __ __ __ － __ __ __ __ __ __ __
Engine type: ___ ___ ___ ___
CONTROL LEVER
SOLID WIRE CABLE
Date Purchased: ______ / ______ / ______
Battery Connections for Electric Starter(applicable types)
Use a 12-volt battery with an am pere-hour rating of at least 18 Ah.
Be careful not to connect the battery in reverse polarity, as this will
short circuit the battery charging system . Always connect the
positive (＋) battery cable to the battery term inal before
connecting the negative (－) battery cable, so your tools cannot
cause a short circuit if they touch a grounded part while tightening Carburetor Modifications for High Altitude Operation
the positive (＋) battery cable end.
At high altitude, the standard carburetor air-fuel m ixture will be
too rich. Perform ance will decrease, and fuel consum ption will
increase. A very rich m ixture will also foul the spark plug and
A battery can explode if you do not follow the correct
procedure, seriously injuring anyone nearby.
cause hard starting. Operation at an altitude that differs from that
at which this engine was certified, for extended periods of tim e,
m ay increase em issions.
Keep all sparks, open flam es, and sm oking m aterials
away from the battery.
High altitude perform ance can be im proved by specific
m odifications to the carburetor. If you always operate your engine
at altitudes above 1,500 m eters (5,000 feet), have your servicing
dealer perform this carburetor m odification. This engine, when
operated at high altitude with the carburetor m odifications for
high altitude use, will m eet each em ission standard throughout its
1. Connect the battery positive (＋) cable to the starter solenoid
term inal as shown.
2. Connect the battery negative (－) cable to an engine m ounting
bolt, fram e bolt, or other good engine ground connection.
3. Connect the battery positive (＋) cable to the battery positive (＋) useful life.
term inal as shown.
4. Connect the battery negative (－) cable to the battery negative
(－) term inal as shown.
5. Coat the term inals and cable ends with grease.
Even with carburetor m odification, engine horsepower will
decrease about 3.5% for each 300-m eter (1,000-foot) increase in
altitude. The effect of altitude on horsepower will be greater than
this if no carburetor m odification is m ade.
NEGATIVE (－) BATTERY CABLE
POSITIVE (＋) BATTERY CABLE
When the carburetor has been m odified for high altitude operation,
the air-fuel m ixture will be too lean for low altitude use. Operation
at altitudes below 1,500 m eters (5,000 feet) with a m odified
carburetor m ay cause the engine to overheat and result in serious
engine dam age. For use at low altitudes, have your servicing
dealer return the carburetor to original factory specifications.
STARTER SOLENOID
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05/04/12 20:12:59 32Z5N600_015
Oxygenated Fuels
Emission Control System Information
Som e conventional gasolines are being blended with alcohol or an
ether com pound. These gasolines are collectively referred to as
oxygenated fuels. To m eet clean air standards, som e areas of the
United States and Canada use oxygenated fuels to help reduce
em issions.
Source of Emissions
The com bustion process produces carbon m onoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides
of nitrogen is very im portant because, under certain conditions,
they react to form photochem ical sm og when subjected to
sunlight. Carbon m onoxide does not react in the sam e way, but it
is toxic.
If you use oxygenated fuel, be sure it is unleaded and m eets the
m inim um octane rating requirem ents.
Honda utilizes lean carburetor settings and other system s to
Before using an oxygenated fuel, try to confirm the fuel’s contents. reduce the em issions of carbon m onoxide, oxides of nitrogen, and
Som e states/provinces require this inform ation to be posted on
the pum p.
hydrocarbons.
The U.S., California Clean Air Acts and Environment Canada
EPA, California and Canadian regulations require all
The following are the EPA approved percentages of oxygenates:
m anufacturers to furnish written instructions describing the
operation and m aintenance of em ission control system s.
ETHANOL
(ethyl or grain alcohol) 10% by volum e
You m ay use gasoline containing up to 10%
ethanol by volum e. Gasoline containing
ethanol m ay be m arketed under the nam e
Gasohol.
The following instructions and procedures m ust be followed in
order to keep the em issions from your Honda engine within the
em ission standards.
MTBE
(m ethyl tertiary butyl ether) 15% by volum e
You m ay use gasoline containing up to 15%
MTBE by volum e.
Tampering and Altering
Tam pering with or altering the em ission control system m ay
increase em issions beyond the legal lim it. Am ong those acts that
constitute tam pering are:
METHANOL
(m ethyl or wood alcohol) 5% by volum e
You m ay use gasoline containing up to 5%
m ethanol by volum e as long as it also
contains cosolvents and corrosion inhibitors
to protect the fuel system . Gasoline
containing m ore than 5% m ethanol by
volum e m ay cause starting and/or
perform ance problem s. It m ay also dam age
m etal, rubber, and plastic parts of your fuel
system .
Rem oval or alteration of any part of the intake, fuel, or exhaust
system s.
Altering or defeating the governor linkage or speed-adjusting
m echanism to cause the engine to operate outside its design
param eters.
Problems That May Affect Emissions
If you are aware of any of the following sym ptom s, have your
engine inspected and repaired by your servicing dealer.
If you notice any undesirable operating sym ptom s, try another
service station or switch to another brand of gasoline.
Fuel system dam age or perform ance problem s resulting from the
use of an oxygenated fuel containing m ore than the percentages
of oxygenates m entioned above are not covered under the
Distributor’s Lim ited Warranty.
Hard starting or stalling after starting.
Rough idle.
Misfiring or backfiring under load.
Afterburning (backfiring).
Black exhaust sm oke or high fuel consum ption.
Replacement Parts
The em ission control system s on your Honda engine were
designed, built, and certified to conform with EPA, California and
Canadian em ission regulations. We recom m end the use of
genuine Honda parts whenever you have m aintenance done.
These original-design replacem ent parts are m anufactured to the
sam e standards as the original parts, so you can be confident of
their perform ance. The use of replacem ent parts that are not of the
original design and quality m ay im pair the effectiveness of your
em ission control system .
A m anufacturer of an afterm arket part assum es the responsibility
that the part will not adversely affect em ission perform ance. The
m anufacturer or rebuilder of the part m ust certify that use of the
part will not result in a failure of the engine to com ply with
em ission regulations.
Maintenance
Follow the m aintenance schedule on page 7 . Rem em ber that this
schedule is based on the assum ption that your m achine will be
used for its designed purpose. Sustained high-load or high-
tem perature operation, or use in unusually wet or dusty conditions,
will require m ore frequent service.
ENGLISH
15
05/04/12 20:13:22 32Z5N600_016
Air Index
Specifications
An Air Index Inform ation hang tag/label is applied to engines
certified to an em ission durability tim e period in accordance with
the requirem ents of the California Air Resources Board.
GXV340
Length × Width ×
Height
433 × 382 × 406 m m
(17.0 × 15.0 × 16.0 in)
31 kg (68 lbs)
Dry weight
The bar graph is intended to provide you, our custom er, the ability
to com pare the em issions perform ance of available engines. The
lower the Air Index, the less pollution.
Engine type
Displacem ent
[Bore × Stroke]
Max. output
Max. torque
4-stroke, overhead valve, single cylinder
338 cm (20.6 cu-in)
[82 × 64 m m (3.2 × 2.5 in)]
6.6 kW (9.0 PS, 8.9 bhp) at 3,600 rpm
21.6 N·m (2.20 kgf·m , 15.9 lbf·ft)
at 2,500 rpm
The durability description is intended to provide you with
inform ation relating the engine’s em ission durability period. The
descriptive term indicates the useful life period for the engine’s
em ission control system . See your Em ission Control System
Warranty for additional inform ation.
Engine oil capacity
Fuel tank capacity
Fuel consum ption
Cooling system
1.10 (1.16 US qt , 0.97 Im p qt)
2.1
2.3 /h at 3,000 rpm
Forced air
Descriptive Term
Moderate
Applicable to Emissions Durability
Period
Ignition system
PTO shaft rotation
Transistorized m agneto
Counterclockwise
50 hours [0－65 cm (0－65 cc)]
125 hours [greater than 65 cm (65 cc)]
125 hours [0－65 cm (0－65 cc)]
250 hours [greater than 65 cm (65 cc)]
300 hours [0－65 cm (0－65 cc)]
500 hours [greater than 65 cm (65 cc)]
GXV390
Length × Width ×
Height
Interm ediate
Extended
433 × 382 × 406 m m
(17.0 × 15.0 × 16.0 in)
32 kg (71 lbs)
Dry weight
Engine type
Displacem ent
[Bore × Stroke]
Max. output
Max. torque
4-stroke, overhead valve, single cylinder
389 cm (23.7 cu-in)
[88 × 64 m m (3.5 × 2.5 in)]
7.6 kW (10.3 PS, 10.2 bhp) at 3,600 rpm
24.2 N·m (2.47 kgf·m , 17.8 lbf·ft) at
2,500 rpm
The Air Index Inform ation hang tag/label m ust rem ain on the
engine until it is sold. Rem ove the hang tag before operating the
engine.
Engine oil capacity
Fuel tank capacity
Fuel consum ption
Cooling system
1.10 (1.16 US qt , 0.97 Im p qt)
2.1
2.5 /h at 3,000 rpm
Forced air
Ignition system
PTO shaft rotation
Transistorized m agneto
Counterclockwise
Tuneup Specifications
ITEM
SPECIFICATION
MAINTENANCE
Spark plug gap
0.70－0.80 m m
Refer to page: 10
(0.028－0.031 in)
1,400 ± 150 rpm
IN: 0.15 ± 0.02 m m
EX: 0.20 ± 0.02 m m
Idle speed
Valve clearance
(cold)
See your
authorized
Honda dealer
Other
No other adjustm ents needed.
specifications
16
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05/04/12 20:13:36 32Z5N600_017
Quick Reference Information
1A CHARGING SYSTEM
3A CHARGING SYSTEM
10A CHARGING SYSTEM
Fuel
Unleaded gasoline
(Refer to page 8)
U.S.
Pum p octane rating 86 or higher
Except Research octane rating 91 or higher
U.S. Pum p octane rating 86 or higher
Engine oil
SAE 10W-30, API SJ or SL, for general use.
Refer to page 8.
Spark plug
Maintenance
BPR5ES (NGK)
W16EPR-U (DENSO)
Before each use:
Check engine oil level. Refer to page 9.
Check air filter. Refer to page 10.
First 20 hours:
Change engine oil. Refer to page 9.
Subsequent:
Refer to the m aintenance schedule on page 7.
Wiring Diagrams
BASIC CIRCUIT
(1) ENGINE STOP SWITCH
(2) SPARK PLUG
(9) BATTERY (12 V)
(10) STARTER MOTOR
(11) STARTER SOLENOID
(12) CHARGING COIL
(13) DIODE
(3) IGNITION COIL
OIL ALERT CIRCUIT
(4) TO ENGINE SWITCH
(5) TO OIL ALERT CIRCUIT
(6) TO ENGINE STOP SWITCH
(7) OIL ALERT BUZZER
(8) OIL LEVEL SWITCH
(14) TO LOAD
(15) RECTIFIER
(16) REGULATOR
Bl
Y
Black
Yellow
Blue
Br
O
Brown
Orange
Light blue
Light green
Pink
Bu
G
Lb
Lg
P
Green
Red
R
W
White
Gr
Gray
12V STARTER CIRCUIT
ENGLISH
17
05/04/12 20:14:04 32Z5N600_018
CONSUMER INFORMATION
Canada:
Honda Canada, Inc.
Distributor/Dealer Locator Information
715 Milner Avenue
Toronto, ON
M1B 2K8
United States, Puerto Rico, and U.S. Virgin Islands:
Call (800) 426-7701
Telephone: (888) 9HONDA9
(888) 946-6329
Toll free
Canada:
Call (888) 9HONDA9
English: (416) 299-3400
French: (416) 287-4776
Facsim ile: (877) 939-0909
(416) 287-4776
Local Toronto dialing area
Local Toronto dialing area
Toll free
Local Toronto dialing area
For European Area:
Australia:
Honda Australia Motorcycle and Power Equipment Pty. Ltd.
1954－1956 Hum e Highway Cam pbellfield Victoria 3061
Customer Service Information
Telephone: (03) 9270 1111
Facsim ile: (03) 9270 1133
Servicing dealership personnel are trained professionals. They
should be able to answer any question you m ay have. If you
encounter a problem that your dealer does not solve to your
satisfaction, please discuss it with the dealership’s m anagem ent.
The Service Manager, General Manager, or Owner can help.
Alm ost all problem s are solved in this way.
For European Area:
Honda Europe NV.
European Engine Center
United States, Puerto Rico, and U.S. Virgin Islands:
If you are dissatisfied with the decision m ade by the dealership’s
m anagem ent, contact the Honda Regional Engine Distributor for
your area.
All Other Areas:
Please contact the Honda distributor in your area for assistance.
If you are still dissatisfied after speaking with the Regional Engine
Distributor, you m ay contact the Honda Office as shown.
All Other Areas:
If you are dissatisfied with the decision m ade by the dealership’s
m anagem ent, contact the Honda Office as shown.
《Honda’s Office》
When you write or call, please provide this inform ation:
Equipm ent m anufacturer’s nam e and m odel num ber that the
engine is m ounted on
Engine m odel, serial num ber, and type (see page 14 )
Nam e of dealer who sold the engine to you
Nam e, address, and contact person of the dealer who services
your engine
Date of purchase
Your nam e, address and telephone num ber
A detailed description of the problem
United States, Puerto Rico, and U.S. Virgin Islands:
American Honda Motor Co., Inc.
Power Equipm ent Division
Custom er Relations Office
4900 Marconi Drive
Alpharetta, GA 30005-8847
Or telephone: (770) 497-6400, 8:30 am - 8:00 pm EST
18
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