Honda Automobiles GX340 User Manual

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 manual contains information 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.

All information in this publication is based on the latest product
information available at the time of printing. Honda Motor Co., Ltd.
reserves the right to make changes at any time without notice and
without incurring any obligation. No part of this publication may
be reproduced without written permission.

This manual should be considered a permanent part of the engine
and should remain with the engine if resold.

Review the instructions provided with the equipment powered by
this engine for any additional information regarding engine
startup, shutdown, operation, adjustments or any special
maintenance 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 document that should have been given to you
by your dealer.

SAFETY MESSAGES

OWNER’S MANUAL

MANUEL DE L’UTILISATEUR

MANUAL DEL PROPIETARIO

GX240 · GX270 · GX340 · GX390

The engine exhaust from this product

contains chemicals known to the State of

California to cause cancer, birth defects

or other reproductive harm.

ENGLISHFRANÇAISESPAÑOL

Your safety and the safety of others are very important. We have
provided important safety messages in this manual and on the
engine. Please read these messages carefully.

A safety message alerts you to potential hazards that could hurt
you or others. Each safety message is preceded by a safety alert
symbol and one of three words, DANGER, WARNING, or
CAUTION.

These signal words mean:

You WILL be KILLED or SERIOUSLY
HURT if you don’t follow instructions.

You CAN be KILLED or SERIOUSLY
HURT if you don’t follow instructions.

You CAN be HURT if you don’t follow
instructions.

Each message 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 important messages that are preceded by
the word NOTICE.

This word means:

Your engine or other property can be damaged if you
don’t follow instructions.

The purpose of these messages is to help prevent damage to your
engine, other property, or the environment.

2008 Honda Motor Co., Ltd. All Rights Reserved

GX240UT1 GX270UT GX340UT1 GX390UT1 GX240RT1 GX270RT GX340RT1 GX390RT1

·······

37Z5K604
00X37-Z5K-6040

−

CONTENTS

.......................INTRODUCTION .1

COMPONENT & CONTROL

................................LOCATION .2

................................FEATURES .3

BEFORE OPERATION

....................................CHECKS .3

..............................OPERATION .4

SAFE OPERATING

THE IMPORTANCE OF

MAINTENANCE

............................SCHEDULE .7

...........................REFUELING .8

...........................ENGINE OIL .8

.........................Oil Change .9

.......................Oil Change .10

......................AIR CLEANER .10

........................Inspection .10

..........................Cleaning .10

ENGLISH

................SAFETY MESSAGES .1

..........SAFETY INFORMATION .2

.....SAFETY LABEL LOCATION .2

.....................PRECAUTIONS .4

......STARTING THE ENGINE .4

......STOPPING THE ENGINE .5

.....SETTING ENGINE SPEED .6

.....SERVICING YOUR ENGINE .7

....................MAINTENANCE .7

......MAINTENANCE SAFETY .7

.......SAFETY PRECAUTIONS .7

............Recommended Oil .8

..................Oil Level Check .9

.........REDUCTION CASE OIL .9

............Recommended Oil .9

..................Oil Level Check .9

..................SEDIMENT CUP .12

......................SPARK PLUG .12

.............SPARK ARRESTER .13

.........................IDLE SPEED .13

HELPFUL TIPS &

......................SUGGESTIONS .13

...STORING YOUR ENGINE .13

................TRANSPORTING .14

TAKING CARE OF

....UNEXPECTED PROBLEMS .15

........FUSE REPLACEMENT .15

..TECHNICAL INFORMATION .16

.....Serial Number Location .16

Battery Connections for

....................Electric Starter .16

.....Remote Control Linkage .16

Carburetor Modifications for

.....High Altitude Operation .17

Emission Control System

.........................Information .17

..............................Air Index .18

.....................Specifications .18

........Tuneup Specifications .19

Quick Reference

.........................Information .19

................Wiring Diagrams .19

.CONSUMER INFORMATION .20

Distributor/Dealer Locator

.........................Information .20

Customer Service

.........................Information .20

1

Understand the operation of all controls and learn how to stop
the engine quickly in case of emergency. Make sure the operator
receives adequate instruction before operating the equipment.
Do not allow children to operate the engine. Keep children and
pets away from the area of operation.
Your engine’s exhaust contains poisonous carbon monoxide.
Do not run the engine without adequate ventilation, and never
run the engine indoors.
The engine and exhaust become very hot during operation.
Keep the engine at least 1 meter (3 feet) away from buildings
and other equipment during operation. Keep flammable
materials away, and do not place anything on the engine while it
is running.

COMPONENT & CONTROL LOCATIONSAFETY INFORMATION

FUEL TANK

OIL DRAIN PLUG

FUEL FILLER CAP

OIL FILLER CAP/DIPSTICK

ELECTRIC STARTER
(applicable types)

SAFETY LABEL LOCATION

This label warns you of potential hazards that can cause serious
injury. Read it carefully.
If the label comes off or becomes hard to read, contact your Honda
dealer for replacement.

The safety label should be located
either on the fuel tank, fan cover
or packaged loosely with the
engine to be applied by the
manufacture.

The label is packaged
with the engine.

See the manufacturer’s
instructions provided
with the equipment.

For Canada:
French label is
packaged with
the engine.

SPARK PLUG

CHOKE LEVER

FUEL
VALVE LEVER

CHOKE ROD
(applicable types)

RECOIL STARTER

AIR CLEANERMUFFLER

STARTER GRIP

ENGINE CONTROL TYPES

EXCEPT ELECTRIC
STARTER TYPES

ENGINE SWITCH

ENGINE SWITCH

Gasoline is highly flammable and explosive.
Turn engine off and let cool before refueling.

ELECTRIC STARTER TYPES

The engine emits toxic poisonous carbon
monoxide gas. Do not run in an enclosed area.

ENGINE SWITCH

Read Owner’s Manual before operation.

2

ENGLISH

BEFORE OPERATION CHECKSFEATURES

OIL ALERT SYSTEM (applicable types)

‘‘Oil Alert is a registered trademark in the United States’’

The Oil Alert system is designed to prevent engine damage
caused by an insufficient amount of oil in the crankcase. Before
the oil level in the crankcase can fall below a safe limit, the Oil
Alert system will automatically stop the engine (the engine switch
will remain in the ON position).

If the engine stops and will not restart, check the engine oil level
(see page ) before troubleshooting in other areas.

9

CIRCUIT PROTECTOR (applicable types)

The circuit protector protects the
battery charging circuit. A short
circuit, or a battery connected
with reverse polarity, will trip the
circuit protector.

The green indicator inside the
circuit protector will pop out to
show that the circuit protector has
switched off. If this occurs,
determine the cause of the
problem, and correct it before
resetting the circuit protector.

CIRCUIT
PROTECTOR

Push the circuit protector button
to reset.

ON

IS YOUR ENGINE READY TO GO?

For your safety, and to maximize the service life of your
equipment, it is very important to take a few moments before you
operate the engine to check its condition. Be sure to take care of
any problem you find, or have your servicing dealer correct it,
before you operate the engine.

Improperly maintaining this engine, or failure to
correct a problem before operation, can cause a
malfunction in which you can be seriously hurt or
killed.

Always perform a pre-operation inspection before
each operation, and correct any problem.

Before beginning your pre-operation checks, be sure the engine is
level and the engine switch is in the OFF position.

Always check the following items 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.

Remove any excessive dirt or debris, especially around the
muffler and recoil starter.

3.

Look for signs of damage.

OFF

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 ). Starting with a full tank will

8

help to eliminate or reduce operating interruptions for refueling.

2.

Check the engine oil level (see page ). Running the engine

9

with a low oil level can cause engine damage.

The Oil Alert system (applicable types) will automatically stop
the engine before the oil level falls below safe limits. However,
to avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.

3.

Check the reduction case oil level on applicable types (see page

9

). Oil is essential to reduction case operation and long life.

4.

Check the air filter element (see page ). A dirty air filter

10
element will restrict air flow to the carburetor, reducing engine
performance.

5.

Check the equipment powered by this engine.

Review the instructions provided with the equipment powered
by this engine for any precautions and procedures that should
be followed before engine startup.

ENGLISH

3

OPERATION

SAFE OPERATING PRECAUTIONS

Before operating the engine for the first time, please review the

SAFETY INFORMATION
OPERATION CHECKS

section on page and the

on page .

3

For your safety, do not operate the engine in an enclosed area
such as a garage. Your engine’s exhaust contains poisonous
carbon monoxide gas that can collect rapidly in an enclosed area
and cause illness or death.

2

BEFORE

To restart a warm engine, leave the choke lever or choke rod in
the OPEN position.

Some engine applications use a remote-mounted choke control
rather than the engine-mounted choke lever shown here. Refer
to the instructions provided by the equipment manufacturer.

3.

Move the throttle lever away from the MIN. position, about 1/3
of the way toward the MAX. position.

Exhaust contains poisonous carbon monoxide gas
that can build up to dangerous levels in closed areas.
Breathing carbon monoxide can cause
unconsciousness or death.

Never run the engine in a closed, or even partly
closed area where people may be present.

Review the instructions provided with the equipment powered by
this engine for any safety precautions that should be observed
with engine startup, shutdown or operation.

STARTING THE ENGINE

1.

Move the fuel valve lever to the ON position.

FUEL VALVE LEVER

OONN

OFF

2.

To start a cold engine, move the choke lever or choke rod

OONN

(applicable types) to the CLOSED position.

CHOKE LEVER

MMIINN..

THROTTLE LEVER

MMIINN..MMAAXX..

1/3 POSITION

Some engine applications use a remote-mounted throttle control
rather than the engine-mounted throttle lever shown here. Refer to
the instructions provided by the equipment manufacturer.

4.

Turn the engine switch to the ON position.

ELECTRIC STARTER TYPESEXCEPT ELECTRIC

STARTER TYPES

ENGINE SWITCH

ON

ON

ON

ON

CCLLOOSSEEDD

4

ENGINE SWITCH

OOPPEENN

CLOSED

CHOKE ROD (applicable types)

ON

OOPPEENN

ENGINE SWITCH

CLOSED

ENGLISH

5.

Operate the starter.

STOPPING THE ENGINE

RECOIL STARTER

Pull the starter grip lightly until you feel resistance, then pull
briskly in the direction of the arrow as shown below. Return the
starter grip gently.

SSTTAARRTTEERR GGRRIIPP

DDiirreeccttiioonn ttoo ppuullll

Do not allow the starter grip to snap back against the engine.
Return it gently to prevent damage to the starter.

ELECTRIC STARTER (applicable types):

Turn the key to the START position,
and hold it there until the engine starts.

To stop the engine in an emergency, simply turn the engine switch
to the OFF position. Under normal conditions, use the following
procedure. Refer to the instructions provided by the equipment
manufacturer.

1.

Move the throttle lever to the MIN. position.

Some engine applications use a remote-mounted throttle
control rather than the engine-mounted throttle lever shown
here.

THROTTLE LEVER

MMIINN..

Turn the engine switch to the OFF position.

2.

EXCEPT ELECTRIC

ELECTRIC STARTER TYPES

MMIINN..

STARTER TYPES

If the engine fails to start within 5
seconds, release the key, and wait at
least 10 seconds before operating the
starter again.

Using the electric starter for more than
5 seconds at a time will overheat the
starter motor and can damage it.

When the engine starts, release the
key, allowing it to return to the ON
position.

6.

If the choke lever or choke rod (applicable types) has been

ENGINE SWITCH
(applicable types)

moved to the CLOSED position to start the engine, gradually
move it to the OPEN position as the engine warms up.

CHOKE LEVER

OPEN

OPEN

CLOSED

SSTTAARRTT

ENGINE SWITCH

OOFFFF

ENGINE SWITCH

OOFFFF

OOFFFF

OOFFFF

ENGINE SWITCH

OOFFFF

CHOKE ROD (applicable types)

OPEN

CLOSED

3.

Turn the fuel valve lever to the OFF position.

FUEL VALVE
LEVER

OFF

ENGLISH

ON

OFF

5

SETTING ENGINE SPEED

Position the throttle lever for the desired engine speed.

Some engine applications use a remote-mounted throttle control
rather than the engine-mounted throttle lever shown here. Refer to
the instructions provided by the equipment manufacturer.

For engine speed recommendations, refer to the instructions
provided with the equipment powered by this engine.

THROTTLE LEVER

MMAAXX..

MMIINN..

MMAAXX..

MMIINN..

6

ENGLISH

SERVICING YOUR ENGINE

THE IMPORTANCE OF MAINTENANCE

Good maintenance is essential for safe, economical and trouble­free operation. It will also help reduce pollution.

Improper maintenance, or failure to correct a
problem before operation, can cause a malfunction in
which you can be seriously hurt or killed.

Always follow the inspection and maintenance
recommendations and schedules in this owner’s
manual.

To help you properly care for your engine, the following pages
include a maintenance schedule, routine inspection procedures,
and simple maintenance procedures using basic hand tools. Other
service tasks that are more difficult, or require special tools, are
best handled by professionals and are normally performed by a
Honda technician or other qualified mechanic.

The maintenance schedule applies to normal operating conditions.
If you operate your engine under severe conditions, such as
sustained high-load or high-temperature operation, or use in
unusually wet or dusty conditions, consult your servicing dealer
for recommendations applicable to your individual needs and use.

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.

MAINTENANCE SCHEDULE

REGULAR SERVICE PERIOD (3)

Perform at every

indicated month or

operating hour interval,

whichever comes first.

ITEM

Engine oil

Reduction case

oil

()

applicable types

Air cleaner

Sediment cup

Spark plug

Spark arrester

()

applicable types

Idle speed

Valve clearance

Combustion

chamber

Fuel tank &

filter

Fuel tube

Internal vent carburetor with dual element type only.

＊

Check level

Change

Check level

Change

Check

Clean

Replace

Clean

Check-adjust

Replace

Clean

Check-adjust

Check-adjust

Clean

Clean

Check

Each

Use

Every 3

First

Months

Month

or

or

50 Hrs

20 Hrs

(1)

After every 500 Hrs. (2)

Every 2 years

(Replace if necessary) (2)

Cyclone type every 6 months or 150 hours.

Every 6

Months

or

100 Hrs

(1)

＊

(2)

Every

Year

or

300 Hrs

＊＊

(2)

(2)

Refer

to

Page

9

9

9

10

10

10 11

−

12

12

13

13

Shop

manual

Shop

manual

Shop

manual

Shop

manual

MAINTENANCE SAFETY

Some of the most important safety precautions follow. However,
we cannot warn you of every conceivable hazard that can arise in
performing maintenance. Only you can decide whether or not you
should perform a given task.

Failure to properly follow maintenance instructions
and precautions can cause you to be seriously hurt or
killed.

Always follow the procedures and precautions in this
owner’s manual.

SAFETY PRECAUTIONS

Make sure the engine is off before you begin any maintenance
or repairs. This will eliminate 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 make 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 non-flammable solvent,
not gasoline, to clean parts. Keep cigarettes, sparks and flames
away from all fuel related parts.

Remember that an authorized Honda servicing dealer knows your
engine best and is fully equipped to maintain and repair it.
To ensure the best quality and reliability, use only new Honda
Genuine parts or their equivalents for repair and replacement.

INTERNAL VENT
CARBURETOR TYPE

STANDARD TYPE

BREATHER TUBE BREATHER TUBE

TUBE CLIP

Replace paper element type only.

＊＊

Cyclone type every 2 years or 600 hours.

(1)

Service more frequently when used in dusty areas.

(2)

These items should be serviced by your Honda servicing
dealer, unless you have the proper tools and are mechanically
proficient. Refer to the Honda shop manual for service
procedures.

(3)

For commercial use, log hours of operation to determine
proper maintenance intervals.

Failure to follow this maintenance schedule could result in non­warrantable failures.

ENGLISH

7

REFUELING

Recommended Fuel

Unleaded gasoline

U.S.
Except U.S.

Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher

This engine is certified to operate on unleaded gasoline with a
pump octane rating of 86 or higher (a research octane rating of 91
or higher).
Refuel in a well-ventilated area with the engine stopped. If the
engine has been running, allow it to cool first. Never refuel the
engine inside a building where gasoline fumes may reach flames
or sparks.
You may use unleaded gasoline containing no more than 10%
ethanol (E10) or 5% methanol by volume. In addition, methanol
must contain cosolvents and corrosion inhibitors. Use of fuels
with content of ethanol or methanol greater than shown above
may cause starting and/or performance problems. It may also
damage metal, rubber, and plastic parts of the fuel system. Engine
damage or performance problems that result from using a fuel
with percentages of ethanol or methanol greater than shown
above are not covered under warranty.

If your equipment will be used on an infrequent or intermittent
basis, please refer to the fuel section of the HELPFUL TIPS &
SUGGESTIONS chapter (see page ) for additional information

13

regarding fuel deterioration.

Add fuel to the bottom of the maximum fuel level limit of the

2.
fuel tank. Do not overfill. Wipe up spilled fuel before starting the
engine.

Refuel carefully to avoid spilling fuel. Do not fill the fuel tank

3.

MMAAXXIIMMUUMM
FFUUEELL LLEEVVEELL

completely. It may be necessary to lower the fuel level
depending on operating conditions. After refueling, tighten the
fuel filler cap securely.

Keep gasoline away from appliance pilot lights, barbecues,
electric appliances, power tools, etc.

Spilled fuel is not only a fire hazard, it causes environmental
damage. Wipe up spills immediately.

ENGINE OIL

Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when refueling.

Stop engine and keep heat, sparks, and flame away.
Refuel only outdoors.
Wipe up spills immediately.

Fuel can damage paint and some types of plastic. Be careful not to
spill fuel when filling your fuel tank. Damage caused by spilled
fuel is not covered under the

Distributor’s Limited Warranty.

Never use stale or contaminated gasoline or an oil/gasoline
mixture. Avoid getting dirt or water in the fuel tank.

For refueling, refer to the manufacturer’s instructions provided
with the equipment. See the following for a Honda supplied
standard fuel tank refueling instruction.

1.

With the engine stopped and on a level surface, remove the fuel
filler cap and check the fuel level. Refill the tank if the fuel level
is low.

FFUUEELL FFIILLLLEERR CCAAPP

Oil is a major factor affecting performance and service life. Use
4-stroke automotive detergent oil.

Recommended Oil

Use 4-stroke motor oil that meets or exceeds the requirements for
API service category SJ or later (or equivalent). Always check the
API service label on the oil container to be sure it includes the
letters SJ or later (or equivalent).

AMBIENT TEMPERATURE

SAE 10W-30 is recommended for general use. Other viscosities
shown in the chart may be used when the average temperature in
your area is within the indicated range.

8

ENGLISH

Oil Level Check

4.

Install the oil filler cap/dipstick and tighten securely.

Check the engine oil level with the engine stopped and in a level
position.

1.

Remove the oil filler cap/dipstick and wipe it clean.

2.

Insert the oil filler cap/dipstick into the oil filler neck as shown,
but do not screw it in, then remove it to check the oil level.

3.

If the oil level is near or below the lower limit mark on the
dipstick, fill with the recommended oil (see page ) to the

8

upper limit mark (bottom edge of the oil fill hole). Do not overfill.

4.

Reinstall the oil filler cap/dipstick.

OIL FILLER CAP/DIPSTICK

OIL FILL HOLE
(bottom edge)

UPPER LIMIT

LOWER LIMIT

Running the engine with a low oil level can cause engine damage.
This type of damage is not covered by the

Distributor’s Limited

Warranty.

The Oil Alert system (applicable types) will automatically stop the
engine before the oil level falls below the safe limit. However, to
avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.

Oil Change

Drain the used oil when the engine is warm. Warm oil drains
quickly and completely.

1.

Place a suitable container below the engine to catch the used oil,
then remove the oil filler cap/dipstick, oil drain plug and washer.

OIL FILLER CAP/
DIPSTICK

WASHER

OIL DRAIN PLUG

OIL LEVEL

REDUCTION CASE OIL (applicable types)

Recommended Oil

Use the same oil that is recommended for the engine (see page ).

8

Oil Level Check

Check the reduction case oil level with the engine stopped and in a
level position.

1/2 Reduction Case With Centrifugal Clutch

1.

Remove the oil filler cap/dipstick and wipe it clean.

2.

Insert and remove the oil filler cap/dipstick without screwing it
into the filler hole. Check the oil level shown on the oil filler cap/
dipstick.

3.

If the oil level is low, add the recommended oil to reach the
upper limit mark on the dipstick.

4.

Screw in the oil filler cap/dipstick and tighten securely.

OIL FILLER CAP/DIPSTICK

UPPER LIMIT

2.

Allow the used oil to drain completely, then reinstall the oil drain
plug and new washer, and tighten the oil drain plug securely.

Please dispose of used motor oil in a manner that is compatible
with the environment. We suggest you take used oil in a sealed
container to your local recycling center or service station for
reclamation. Do not throw it in the trash, pour it on the ground,
or pour it down a drain.

3.

With the engine in a level position, fill with the recommended oil
(see page ) to the upper limit mark (bottom edge of the oil fill

8

hole) on the dipstick.

Running the engine with a low oil level can cause engine
damage. This type of damage is not covered by the

Distributor’s

Limited Warranty.

The Oil Alert system (applicable types) will automatically stop
the engine before the oil level falls below the safe limit.
However, to avoid the inconvenience of an unexpected
shutdown, fill to the upper limit, and check the oil level regularly.

ENGLISH

LOWER LIMIT

9

Oil Change

AIR CLEANER

Drain the used oil while the engine is warm. Warm oil drains
quickly and completely.

Place a suitable container below the reduction case to catch the

1.
used oil, then remove the oil filler cap/dipstick, the drain plug
and washer.

Allow the used oil to drain completely, then reinstall the drain

2.
plug and a new washer, and tighten it securely.

Please dispose of used motor oil in a manner that is compatible
with the environment. We suggest you take used oil in a sealed
container to your local recycling center or service station for
reclamation. Do not throw it in the trash or pour it on the ground
or pour it down a drain.

3.
(see page ) to the upper limit mark on the dipstick. To check the

8
oil level, insert and remove the dipstick without screwing it into
the filler hole.

Reduction case oil capacity:

0.30 L (0.32 US qt, 0.26 lmp qt)

Running the engine with a low reduction case oil level can cause
reduction case damage.

Screw in the oil filler cap/dipstick and tighten securely.

4.

OIL FILLER CAP/DIPSTICK

UPPER LIMIT

LOWER LIMIT

DRAIN PLUG

A dirty air cleaner will restrict air flow to the carburetor, reducing
engine performance. If you operate the engine in very dusty areas,
clean the air filter more often than specified in the MAINTENANCE
SCHEDULE (see page ).

7

Operating the engine without an air filter, or with a damaged air
filter, will allow dirt to enter the engine, causing rapid engine wear.
This type of damage is not covered by the

Distributor’s Limited

Warranty.

Inspection

Remove the air cleaner cover and inspect the filter elements.
Clean or replace dirty filter elements. Always replace damaged
filter elements. If equipped with an oil-bath air cleaner, also check
the oil level.With the engine in a level position, fill with the recommended oil

Refer to pages for instructions that apply to the air cleaner

−

10 11

and filter for your engine type.

Cleaning

Dual-Filter Element Types

Remove the wing nut from

1.

STANDARD DUAL-FILTER
ELEMENT TYPE

WING NUT

the air cleaner cover, and
remove the cover.

Remove the wing nut from

2.

AIR CLEANER
COVER

WING NUT

the air filter, and remove the
filter.

Remove the foam filter from

3.
the paper filter.

Inspect both air filter

4.

PAPER FILTER
ELEMENT

FOAM FILTER
ELEMENT

elements, and replace them if
they are damaged. Always

GASKET

replace the paper air filter
element at the scheduled
interval (see page ).

7

10

SPECIAL PAN SCREW (3)

CYCLONE HOUSING

ENGLISH

CYCLONE DUAL-FILTER ELEMENT TYPE

PRECLEANER CAP

AIR GUIDE

GROOVE

WING NUT

AIR CLEANER COVER

TAB

WING NUT

PAPER FILTER ELEMENT

FOAM FILTER ELEMENT

GASKET

Clean the air filter elements if they are to be reused.

5.

Paper air filter element: Tap the filter element several times on a
hard surface to remove dirt, or blow compressed air [not
exceeding 207 kPa (2.1 kgf/cm

, 30 psi)] through the filter
element from the inside. Never try to brush off dirt; brushing will
force dirt into the fibers.

Foam air filter element: Clean in warm soapy water, rinse, and
allow to dry thoroughly. Or clean in non-flammable solvent and
allow to dry. Dip the filter element in clean engine oil, then
squeeze out all excess oil. The engine will smoke when started if
too much oil is left in the foam.

CYCLONE TYPE ONLY: Remove the three pan-head screws from

6.
the pre-cleaner cap, then remove the cyclone housing and air
guide. Wash the parts with water, dry them thoroughly, and
reassemble them.

6.

Reassemble the air cleaner, and tighten the wing nut securely.

OIL-BATH TYPE

WING NUT
AIR

CLEANER
COVER

FOAM
FILTER
ELEMENT

GRID

AIR
CLEANER
CASE

CAP

STEEL
WOOL

OIL LEVEL

SINGLE-FILTER ELEMENT TYPE

WING NUT

AIR
CLEANER
COVER

FOAM
FILTER
ELEMENT

GRID

Be sure to install the air guide as shown in the illustration.

Install the cyclone housing so the air intake tab fits into the
groove in the pre-cleaner cap.

Wipe dirt from the inside of the air cleaner case and cover using

7.
a moist rag. Be careful to prevent dirt from entering the air duct
that leads to the carburetor.

Place the foam air filter element over the paper element, and

8.
reinstall the assembled air filter. Be sure the gasket is in place
beneath the air filter. Tighten the air filter wing nut securely.

Install the air cleaner cover, and tighten the wing nut securely.

9.

Oil Bath & Single-Filter Element Types

Remove the wing nut, and remove the air cleaner cap and cover.

1.

Remove the air filter element from the cover. Wash the cover

2.
and filter element in warm soapy water, rinse, and allow to dry
thoroughly. Or clean in non-flammable solvent and allow to dry.

Dip the filter element in clean engine oil, then squeeze out all

3.
excess oil. The engine will smoke if too much oil is left in the
foam.

Low Profile Types

Unsnap the air cleaner cover clips,

1.
remove the air cleaner cover, and
remove the air filter element.

2.

Wash the element in a solution of
household detergent and warm
water, then rinse thoroughly, or
wash in non-flammable or high
flash point solvent. Allow the
element to dry thoroughly.

Soak the air filter element in clean

3.
engine oil and squeeze out the
excess oil. The engine will smoke
during initial startup if too much
oil is left in the element.

Reinstall the air filter element and

4.
the cover.

AIR CLEANER COVER

CLIP

CLIP

AIR FILTER ELEMENT

OIL BATH TYPE ONLY: Empty the used oil from the air cleaner

4.
case, wash out any accumulated dirt with non-flammable
solvent, and dry the case.

OIL BATH TYPE ONLY: Fill the air cleaner case to the OIL LEVEL

5.
mark with the same oil that is recommended for the engine (see
page ).

8

Oil capacities:

GX240/GX270:
GX340/GX390:

60 cm
80 cm

(2.0 US oz , 2.1 Imp oz)
(2.7 US oz , 2.8 Imp oz)

ENGLISH

AIR FILTER ELEMENT

11

SEDIMENT CUP

SPARK PLUG

Cleaning

Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when handling
fuel.

Stop engine and keep heat, sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.

1.

Move the fuel valve lever to the OFF position, then remove the
sediment cup and O-ring.

2.

Wash the sediment cup in non-flammable solvent, and dry it
thoroughly.

FUEL VALVE LEVER

O-RING

OFF

SEDIMENT CUP

Recommended Spark Plugs:

BPR6ES (NGK)
W20EPR-U (DENSO)

The recommended spark plug has the correct heat range for
normal engine operating temperatures.

An incorrect spark plug can cause engine damage.

If the engine has been running, let it cool before servicing the
spark plug.

For good performance, the spark plug must be properly gapped
and free of deposits.

1.

Disconnect the spark plug cap,

SPARK PLUG WRENCH

and remove any dirt from
around the spark plug area.

2.

Remove the spark plug with a
13/16-inch spark plug wrench.

3.

Visually inspect the spark
plug. Replace it if damaged or
badly fouled, if the sealing
washer is in poor condition,

SPARK PLUG CAP

or if the electrode is worn.

4.

Measure the spark plug
electrode gap with a wire­type feeler gauge. Correct the

SIDE ELECTRODE

0.7 0.8 mm

−

(0.028 0.031 in)

−

gap, if necessary, by carefully
bending the side electrode.
The gap should be:

0.7 0.8 mm (0.028 0.031 in)

−−

SEALING
WASHER

3.

Place the O-ring in the fuel valve, and install the sediment cup.
Tighten the sediment cup securely.

Move the fuel valve lever to the ON position, and check for leaks.

4.
Replace the O-ring if there is any leakage.

5.

Install the spark plug carefully,
by hand, to avoid cross­threading.

6.

After the spark plug is seated, tighten with a 13/16-inch spark
plug wrench to compress the sealing washer.

When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer.

When reinstalling the original spark plug, tighten 1/8 1/4 turn

−

after the spark plug seats to compress the washer.

A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the
cylinder head.

7.

Attach the spark plug cap to the spark plug.

12

ENGLISH

SPARK ARRESTER (applicable types)

HELPFUL TIPS & SUGGESTIONS

The spark arrester may be standard or an optional part, depending
on the engine type. In some areas, it is illegal to operate an engine
without a spark arrester. Check local laws and regulations. A spark
arrester is available from authorized Honda servicing dealers.

The spark arrester must be serviced every 100 hours to keep it
functioning as designed.

If the engine has been running, the muffler will be hot. Allow it to
cool before servicing the spark arrester.

Spark Arrester Removal

Remove the two 8 mm nuts and remove the muffler from the

1.
cylinder.

Remove the three 4 mm screws from the exhaust deflector, and

2.
remove the deflector.

Remove the four 5 mm screws from the muffler protector and

3.
remove the muffler protector.

Remove the 4 mm screw from the spark arrester, and remove

4.
the spark arrester from the muffler.

5 mm SCREWS

MUFFLER
PROTECTOR

EXHAUST
DEFLECTOR

4 mm SCREW

4mm
SCREWS

SPARK
ARRESTER

8 mm NUTS

SPARK ARRESTER

MUFFLER

Spark Arrester Cleaning & Inspection

Use a brush to remove carbon

1.
deposits from the spark arrester
screen. Be careful not to damage
the screen. Replace the spark
arrester if it has breaks or holes.

SCREEN

STORING YOUR ENGINE

Storage Preparation

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 impairing your engine’s function and
appearance, and will make the engine easier to start when you use
it again.

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
damaged paint, and coat other areas that may rust with a light film
of oil.

Using a garden hose or pressure washing equipment can force
water into the air cleaner or muffler opening. Water in the air
cleaner will soak the air filter, and water that passes through the
air filter or muffler can enter the cylinder, causing damage.

Fuel

Depending on the region where you operate your equipment, fuel
formulations may deteriorate and oxidize rapidly. Fuel
deterioration and oxidation can occur in as little as 30 days and
may cause damage to the carburetor and/or fuel system. Please
check with your servicing dealer for local storage
recommendations.

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 may need to have the carburetor and other
fuel system components serviced or replaced.

The length of time that gasoline can be left in your fuel tank and
carburetor without causing functional problems will vary with
such factors as gasoline blend, your storage temperatures, and
whether the fuel tank is partially or completely filled. The air in a
partially filled fuel tank promotes fuel deterioration. Very warm
storage temperatures accelerate fuel deterioration. Fuel
deterioration problems may occur within a few months, or even
less if the gasoline was not fresh when you filled the fuel tank.

Fuel system damage or engine performance problems resulting
from neglected storage preparation are not covered under the

Distributor’s Limited Warranty

.

Install the spark arrester, muffler protector, exhaust deflector

2.
and muffler in the reverse order of disassembly.

IDLE SPEED

Adjustment

Start the engine outdoors, and

1.
allowittowarmuptooperating
temperature.

Move the throttle lever to its

2.
minimum position.

Turn the throttle stop screw to

3.
obtain the standard idle speed.

THROTTLE STOP SCREW

Standard idle speed:

1,400 rpm150

±

You can extend fuel storage life by adding a gasoline stabilizer
that is formulated for that purpose, or you can avoid fuel
deterioration problems by draining the fuel tank and carburetor.

Adding a Gasoline Stabilizer to Extend Fuel Storage Life

When adding a gasoline stabilizer, fill the fuel tank with fresh
gasoline. If only partially filled, air in the tank will promote fuel
deterioration during storage. If you keep a container of gasoline
for refueling, be sure that it contains only fresh gasoline.

Add gasoline stabilizer following the manufacturer’s instructions.

1.

After adding a gasoline stabilizer, run the engine outdoors for 10

2.
minutes to be sure that treated gasoline has replaced the
untreated gasoline in the carburetor.

Stop the engine.

3.

ENGLISH

13

Draining the Fuel Tank and Carburetor

Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when handling
fuel.

Storage Precautions

If your engine will be stored with gasoline in the fuel tank and
carburetor, it is important to reduce the hazard of gasoline vapor
ignition. Select a well-ventilated storage area away from any
appliance that operates with a flame, such as a furnace, water
heater, or clothes dryer. Also avoid any area with a spark­producing electric motor, or where power tools are operated.

Stop engine and keep heat, sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.

1.

Move the fuel valve lever to the OFF positions.

2.

Place an approved gasoline container below the carburetor, and
use a funnel to avoid spilling fuel.

3.

Remove the carburetor drain bolt and gasket. Remove the
sediment cup and O-ring, then move the fuel valve lever to the
ON position.

FUEL VALVE LEVER

ON

GASKET

DRAIN BOLT

4.

After all the fuel has drained into the container, reinstall the

O-RING

SEDIMENT CUP

drain bolt, gasket, sediment cup and O-ring. Tighten the drain
bolt and sediment cup securely.

Engine Oil

1.

Change the engine oil (see page ).

2.

Remove the spark plug (see page ).

9

12

If possible, avoid storage areas with high humidity, because that
promotes rust and corrosion.

Keep the engine level in storage. Tilting can cause 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 melt
some materials. Do not use sheet plastic as a dust cover.
A nonporous cover will trap moisture around the engine,
promoting rust and corrosion.

If equipped with a battery for electric starter types, recharge the
battery once a month while the engine is in storage.
This will help to extend the service life of the battery.

Removal from Storage

Check your engine as described in the

CHECKS

section of this manual (see page ).

BEFORE OPERATION

3

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 time, causing hard starting.

If the cylinder was coated with oil during storage preparation, the
engine will smoke briefly at startup. This is normal.

TRANSPORTING

If the engine has been running, allow it to cool for at least 15
minutes before loading the engine-powered equipment on the
transport vehicle. A hot engine and exhaust system can burn you
and can ignite some materials.

3.

Pour a teaspoon 5 10 cm

−−

(5 10 cc) of clean engine oil into the

cylinder.

4.

Pull the starter grip several times to distribute the oil in the
cylinder.

5.

Reinstall the spark plug.

6.

Pull the starter grip slowly until resistance is felt and the notch
on the starter pulley aligns with the hole at the top of the recoil
starter cover. This will close the valves so moisture cannot enter
the engine cylinder. Return the starter grip gently.

Align notch on pulley
with hole at top of cover.

14

Keep the engine level when transporting to reduce the possibility
of fuel leakage. Turn the fuel valve to the OFF position (see

5

page ).

ENGLISH

TAKING CARE OF UNEXPECTED PROBLEMS

FUSE REPLACEMENT (applicable types)

ENGINE WILL
NOT START

1.

Electric
starting
(applicable
types):
Check battery
and fuse.

2.

Check control
positions.

3.

Check engine
oil level.

4.

Check fuel.

5.

Remove and
inspect spark
plug.

6.

Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.

Possible Cause Correction

Battery

Recharge battery.

discharged.

Fuse burnt out.

Replace fuse.
(p. 15).

Fuel valve OFF.

Move lever to ON
position.

Choke open.

Move lever to
CLOSED position
unless the engine

is warm.
Engine switch
OFF.
Engine oil level
low (Oil Alert
models).

Turn engine switch

to ON position.

Fill with the

recommended oil

to the proper level

(p. 9).
Out of fuel.
Bad fuel; engine
stored without
treating or
draining

Refuel (p. 8).

Drain fuel tank and

carburetor (p. 14).

Refuel with fresh

gasoline (p. 8).
gasoline, or
refueled with
bad gasoline.
Spark plug faulty,
fouled, or

Gap or replace

spark plug (p. 12).
improperly
gapped.
Spark plug wet
with fuel
(flooded engine).

Dry and reinstall

spark plug. Start

engine with

throttle lever in

MAX. position.
Fuel filter
restricted,
carburetor

Replace or repair

faulty components

as necessary.
malfunction,
ignition
malfunction,
valves stuck, etc.

The electric starter relay circuit and battery charging circuit are
protected by a fuse. If the fuse burns out, the electric starter will
not operate. The engine can be started manually if the fuse burns
out, but running the engine will not charge the battery.

1.

Remove the 6 12 mm screw from the rear cover of the engine

×

switch box.

Remove the fuse cover, then pull out and inspect the fuse.

2.

If the fuse is burnt out, discard the burnt-out fuse. Install a new
fuse with the same rating as the one that was removed, and
reinstall the cover.
If you have questions regarding the rating of the original fuse,
contact your servicing Honda engine dealer.

Never use a fuse with a rating greater than the one originally
equipped with the engine. Serious damage to the electrical
system or a fire could result.

Reinstall the rear cover. Install the 6 12 mm screw and tighten

3.

×

it securely.

FUSE
COVER

FUSE

ENGINE SWITCH
REAR COVER

612mm
SPECIAL SCREW

×

Frequent fuse failure usually indicates a short circuit or an
overload in the electrical system. If the fuse burns out frequently,
take the engine to a servicing Honda dealer for repair.

ENGINE LACKS
POWER

1.

Check air filter.

2.

Check fuel.

3.

Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.

Possible Cause Correction

Filter element(s)
restricted.

Bad fuel; engine
stored without
treating or
draining

Clean or replace

filter element(s)

(p. 10 11).

−

Drain fuel tank and

carburetor (p. 14).

Refuel with fresh

gasoline (p. 8).
gasoline, or
refueled with
bad gasoline.
Fuel filter
restricted,
carburetor

Replace or repair

faulty components

as necessary.
malfunction,
ignition
malfunction,
valves stuck, etc.

ENGLISH

15

TECHNICAL INFORMATION

Remote Control Linkage

Serial Number Location

Record the engine serial
number in the space below. You
will need this information when
ordering parts and when
making technical or warranty
inquiries.

SERIAL NUMBER &
ENGINE TYPE LOCATION

Engine serial number: __ __ __ __ __ __ __ __ __ __ __

−

ELECTRIC STARTER

(applicable types)

Engine type: ___ ___ ___ ___

Date Purchased: ______ / ______ / ______

Battery Connections for Electric Starter (applicable types)

Recommended Battery

GX240

12V 14Ah 12V 30Ah

−−

〜

GX270
GX340

12V 18Ah 12V 30Ah

−−

〜

GX390

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 terminal before
connecting the negative ( ) battery cable, so your tools cannot

＋

−

cause a short circuit if they touch a grounded part while tightening
the positive ( ) battery cable end.

＋

The throttle and choke control levers are provided with holes for
optional cable attachment. The following illustrations show
installation examples for a solid wire cable and for a flexible,
braided wire cable. If using a flexible, braided wire cable, add a
return spring as shown.

It is necessary to loosen the throttle lever friction nut when
operating the throttle with a remote-mounted control.

REMOTE THROTTLE LINKAGE

RETURN SPRING

THROTTLE LEVER
FRICTION NUT

Flexible wire core
mounting

4 mm SCREW

WIRE

5mm
CIRCLIP

Solid wire core
mounting

REMOTE CHOKE LINKAGE

WIRE HOLDER

THROTTLE
LEVER

OPTIONAL

A battery can explode if you do not follow the correct
procedure, seriously injuring anyone nearby.

Keep all sparks, open flames, and smoking materials
away from the battery.

WARNING:

contain lead and lead compounds.

1.

Connect the battery positive ( ) cable to the starter solenoid

Battery posts, terminals, and related accessories

Wash hands after handling.

＋

terminal as shown.

2.

Connect the battery negative ( ) cable to an engine mounting

−

bolt, frame bolt, or other good engine ground connection.

3.

Connect the battery positive ( ) cable to the battery positive ( )

＋＋

terminal as shown.

4.

Connect the battery negative ( ) cable to the battery negative

−

( ) terminal as shown.

5.

Coat the terminals and cable ends with grease.

NEGATIVE ( )
BATTERY CABLE

−

−

STARTER
SOLENOID

WIRE HOLDER

CHOKE LEVER

16

POSITIVE ( ) BATTERY CABLE

＋

ENGLISH

Carburetor Modifications for High Altitude Operation

Emission Control System Information

At high altitude, the standard carburetor air-fuel mixture will be
too rich. Performance will decrease, and fuel consumption will
increase. A very rich mixture will also foul the spark plug and
cause hard starting. Operation at an altitude that differs from that
at which this engine was certified, for extended periods of time,
may increase emissions.

High altitude performance can be improved by specific
modifications to the carburetor. If you always operate your engine
at altitudes above 1,500 meters (5,000 feet), have your servicing
dealer perform this carburetor modification. This engine, when
operated at high altitude with the carburetor modifications for
high altitude use, will meet each emission standard throughout its
useful life.

Even with carburetor modification, engine horsepower will
decrease about 3.5% for each 300-meter (1,000-foot) increase in
altitude. The effect of altitude on horsepower will be greater than
this if no carburetor modification is made.

When the carburetor has been modified for high altitude operation,
the air-fuel mixture will be too lean for low altitude use. Operation
at altitudes below 1,500 meters (5,000 feet) with a modified
carburetor may cause the engine to overheat and result in serious
engine damage. For use at low altitudes, have your servicing
dealer return the carburetor to original factory specifications.

Source of Emissions

The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides
of nitrogen is very important because, under certain conditions,
they react to form photochemical smog when subjected to
sunlight. Carbon monoxide does not react in the same way, but it
is toxic.

Honda utilizes appropriate air/fuel ratios and other emissions
control systems to reduce the emissions of carbon monoxide,
oxides of nitrogen, and hydrocarbons.
Additionally, Honda fuel systems utilize components and control
technologies to reduce evaporative emissions.

The U.S., California Clean Air Acts and Environment Canada

EPA, California and Canadian regulations require all
manufacturers to furnish written instructions describing the
operation and maintenance of emission control systems.

The following instructions and procedures must be followed in
order to keep the emissions from your Honda engine within the
emission standards.

Tampering and Altering

Tampering with or altering the emission control system may
increase emissions beyond the legal limit. Among those acts that
constitute tampering are:

Removal or alteration of any part of the intake, fuel, or exhaust
systems.
Altering or defeating the governor linkage or speed-adjusting
mechanism to cause the engine to operate outside its design
parameters.

Problems That May Affect Emissions

If you are aware of any of the following symptoms, have your
engine inspected and repaired by your servicing dealer.

Hard starting or stalling after starting.
Rough idle.
Misfiring or backfiring under load.
Afterburning (backfiring).
Black exhaust smoke or high fuel consumption.

Replacement Parts

The emission control systems on your Honda engine were
designed, built, and certified to conform with EPA, California
(models certified for sale in California), and Canadian emission
regulations. We recommend the use of Honda Genuine parts
whenever you have maintenance done. These original-design
replacement parts are manufactured to the same standards as the
original parts, so you can be confident of their performance. The
use of replacement parts that are not of the original design and
quality may impair the effectiveness of your emission control
system.
A manufacturer of an aftermarket part assumes the responsibility
that the part will not adversely affect emission performance. The
manufacturer or rebuilder of the part must certify that use of the
part will not result in a failure of the engine to comply with
emission regulations.

Maintenance

Follow the maintenance schedule on page . Remember that this

7
schedule is based on the assumption that your machine will be
used for its designed purpose. Sustained high-load or high­temperature operation, or use in unusually wet or dusty conditions,
will require more frequent service.

ENGLISH

17

(Models certified for sale in California)

An Air Index Information label is applied to engines certified to an
emission durability time period in accordance with the
requirements of the California Air Resources Board.

The bar graph is intended to provide you, our customer, the ability
to compare the emissions performance of available engines. The
lower the Air Index, the less pollution.

The durability description is intended to provide you with
information relating to the engine’s emission durability period.
The descriptive term indicates the useful life period for the engine’s
emission control system. See your

Warranty

for additional information.

Emission Control System

Descriptive Term Applicable to Emissions Durability Period

Moderate

50 hours (0 80 cc, inclusive)

−

125 hours (greater than 80 cc)

Intermediate

125 hours (0 80 cc, inclusive)

−

250 hours (greater than 80 cc)

Extended

300 hours (0 80 cc, inclusive)

−

500 hours (greater than 80 cc)

1,000 hours (225 cc and greater)

SpecificationsAir Index

GX240/GX270 (PTO shaft type S, with fuel tank)

Length Width

××

Height
Dry mass [weight]
Engine type
Displacement
[Bore Stroke]

×

Net power

(in accordance
with SAE J1349 )

＊

Max. Net torque

(in accordance
with SAE J1349 )

＊

Engine oil capacity
Fuel tank capacity
Cooling system
Ignition system
PTO shaft rotation

GX240

GX270

GX240

GX270

GX240

GX270

4-stroke, overhead valve, single cylinder

[73.0 58.0 mm (2.9 2.3 in)]

[77.0 58.0 mm (3.0 2.3 in)]

5.3 kW (7.2 PS, 7.1 bhp) at 3,600 rpm

6.0 kW (8.2 PS, 8.0 bhp) at 3,600 rpm

15.3 N·m (1.56 kgf·m, 11.3 lbf·ft)

17.7 N·m (1.80 kgf·m, 13.1 lbf·ft)

5.3 L (1.40 US gal, 1.17 lmp gal)

××

355 430 422 mm

××

(14.016.916.6in)

25.0 kg (55.1 lbs)

242 cm

(14.8 cu-in)

××

270 cm

(16.5 cu-in)

××

at 2,500 rpm

at 2,500 rpm

1.1L(1.2USqt,1.0lmpqt)

Forced air

Transistor magneto

Counterclockwise

GX340/GX390 (PTO shaft type S, with fuel tank)

Length Width

××

Height
Dry mass [weight]
Engine type
Displacement
[Bore Stroke]

×

Net power

(in accordance
with SAE J1349 )

＊

Max. Net torque

(in accordance
with SAE J1349 )

＊

Engine oil capacity
Fuel tank capacity
Cooling system
Ignition system
PTO shaft rotation

4-stroke, overhead valve, single cylinder

GX340

GX390

GX340

GX390

GX340

GX390

7.1 kW (9.7 PS, 9.5 bhp) at 3,600 rpm

8.2 kW (11.1 PS, 11.0 bhp) at 3,600 rpm

380 450 447 mm

××

(15.0 17.7 17.6 in)

××

31.5 kg (69.4 lbs)

337 cm

××

[82.0 64.0 mm (3.2 2.5 in)]

389 cm

××

[88.0 64.0 mm (3.5 2.5 in)]

(20.6 cu-in)

(23.7 cu-in)

22.1 N·m (2.25 kgf·m, 16.3 lbf·ft)
at 2,500 rpm

25.1 N·m (2.56 kgf·m, 18.5 lbf·ft)
at 2,500 rpm

1.1L(1.2USqt,1.0lmpqt)

6.1 L (1.61 US gal, 1.34 lmp gal)

Forced air

Transistor magneto

Counterclockwise

18

The power rating of the engine indicated in this document is the

＊

net power output tested on a production engine for the engine
model and measured in accordance with SAE J1349 at 3,600
rpm (Net Power) and at 2,500 rpm (Max. Net Torque). Mass
production engines may vary from this value.
Actual power output for the engine installed in the final machine
will vary depending on numerous factors, including the
operating speed of the engine in application, environmental
conditions, maintenance, and other variables.

ENGLISH