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 todo 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
GX120 · GX160 · GX200
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 potentialhazards that could hurt
you or others.Each safety message is preceded by a safety alert
symboland 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.
2005 Honda Motor Co., Ltd.All Rights Reserved
00X37-Z4F-6030
−
GX120U1·GX160U1·GX200U
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.1137Z4F603
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
............RecommendedOil.8
..................Oil Level Check.9
.........REDUCTION CASE OIL.9
............RecommendedOil.9
..................Oil Level Check.9
..................SEDIMENTCUP.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& CONSUMER
.......................INFORMATION.16
.....Serial Number Location.16
Battery Connections for
....................Electric Starter.16
.....Remote Control Linkage.16
Carburetor Modifications for
.....High Altitude Operation.16
...............OxygenatedFuels.17
Emission Control System
.........................Information.17
..............................Air Index.18
.....................Specifications.18
........Tuneup Specifications.18
Quick Reference
.........................Information.19
................Wiring Diagrams.19
.CONSUMER INFORMATION .20
Distributor/DealerLocator
.........................Information.20
CustomerService
.........................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
OIL DRAIN PLUG
FUEL TANK
FUEL FILLER CAP
ELECTRIC STARTER
(applicable types)
OIL FILLER CAP/DIPSTICK
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.
For Canadian types only:
French label comes with
the engine.
SPARK PLUG
FUEL VALVE LEVER
CHOKE LEVER
THROTTLE LEVER
AIR CLEANER
MUFFLER
STARTER GRIP
ENGINE CONTROL TYPES
EXCEPT ELECTRIC
STARTER TYPES
RECOIL STARTER
ENGINE SWITCH
CHOKE LEVER
Gasoline is highly flammable and explosive.
(air cleaner low profile type)
Turn engine off and let cool before refueling.
The engine emits toxic poisonous carbon
monoxide gas. Do not run in an enclosed area.
ENGINE SWITCH
ELECTRIC STARTER TYPES
ENGINE
SWITCH
Read Owner’s Manual before operation.
CIRCUIT
PROTECTOR
2
ENGLISH
BEFORE OPERATION CHECKSFEATURES
OIL ALERT SYSTEM (applicable types)
The Oil Alert
system is designedto prevent enginedamage
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
switchedoff. If this occurs,
determine the cause of the
problem, and correct it before
CIRCUIT
PROTECTOR
resetting the circuit protector.
Push the circuit protector button
to reset.
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 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 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
gasolineleaks.
ON
OFF
2.
Remove any excessive dirt or debris, especially around the
muffler and recoil starter.
3.
Look for signs of damage.
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
4.
Turn the engine switch to the ON position.
SAFE OPERATING PRECAUTIONS
Before operating the engine for the first time, please review the
SAFETY INFORMATION
OPERATIONCHECKS
on page .
section on page and the
3
2
BEFORE
Carbon monoxide gas is toxic. Breathing it can cause
unconsciousness and even kill you.
Avoid any areas or actions that expose you to carbon
monoxide.
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.
FFUUEELL VVAALLVVEE LLEEVVEERR
STARTER TYPES
ENGINE SWITCH
ON
ON
ON
ELECTRIC STARTER TYPESEXCEPT ELECTRIC
ENGINE
SWITCH
ON
ON
OONN
OONN
OFF
To start a cold engine,move the choke lever to the CLOSED
2.
position.
CHOKE LEVER
CCLLOOSSEEDD
CCLLOOSSEEDD
OOPPEENN
To restart a warm engine, leave the choke lever 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.
ON
ENGINE SWITCH
MMIINN..
MMAAXX..
THROTTLE LEVER
MMIINN..
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
ENGLISH
5.
Operate the starter.
STOPPING THE ENGINE
RECOIL STARTER:
Pull the starter grip lightly until you feel resistance, then pull
briskly. Return the starter grip gently.
SSTTAARRTTEERR GGRRIIPP
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):
SSTTAARRTT
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 within5
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 has been moved to the CLOSED position to
ENGINE SWITCH
(applicable types)
start the engine, gradually move it to the OPEN position as the
engine warms up.
CCHHOOKKEE LLEEVVEERR
OOPPEENN
CCLLOOSSEEDD
OOPPEENN
SSTTAARRTT
OOFFFF
ENGINE SWITCH
ENGINE SWITCH
OOFFFF
OOFFFF
OOFFFF
ENGINE
SWITCH
OOFFFF
OOFFFF
Turn the fuel valve lever to the OFF position.
3.
FUEL VALVE
LEVER
OFF
ENGLISH
OONN
OFF
5
SETTING ENGINE SPEED
Positionthe 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 inspectionand 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 filter
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.
Some of the most important safety precautionsfollow. 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 potentialhazards:
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 instructionsbeforeyou 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 nonflammable 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 genuine
Honda parts or their equivalents for repair and replacement.
STANDARD TYPEINTERNAL VENT
CARBURETOR TYPE
BREATHER TUBEBREATHER 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 servicing dealer,
unless you have the proper tools and are mechanically
proficient. Refer to Honda shop manual for service procedures.
For commercial use, log hours of operation to determine
(3)
proper maintenanceintervals.
Failure to follow this maintenance schedule could result in nonwarrantablefailures.
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
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 completely. Fill tank to
approximately 25 mm (1 inch) below the top of the fuel tank to
allow for fuel expansion. It may be necessary to lower the fuel
level depending on operatingconditions. After refueling, tighten
the fuel tank cap securely.
This engine is certified to operate on unleaded gasoline. Unleaded
gasoline produces fewer engine and spark plug deposits and
extends exhaust system life.
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 contaminatedgasoline or oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.
Occasionally you may hear a light ‘‘spark knock’’ or ‘‘pinging’’
(metallic rapping noise) while operatingunder heavy loads. This is
no cause for concern.
If spark knock or pinging occurs at a steady engine speed, under
normal load, change brands of gasoline. If spark knock or pinging
persists, see an authorized Honda servicing dealer.
Never refuel the engine inside a buildingwhere gasoline fumes
may reach flames 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 environmental
damage. Wipe up spills immediately.
For information regarding oxygenated fuels, please refer to page
.
17
ENGINE OIL
Oil is a major factor affecting performance and service life. Use
4-stroke automotivedetergentoil.
Recommended Oil
SAE Viscosity Grades
Use 4-stroke motor oil that
meets or exceeds the
requirements for API service
classification SJ, SL, or
equivalent.Always check the
API service label on the oil
container to be sure it includes
AMBIENT TEMPERATURE
the letters SJ, SL, or equivalent.
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.
Running the engine with persistent spark knock or pinging can
cause engine damage.
Running the engine with persistent spark knock or pinging is
consideredmisuse, and the
Distributor’s Limited Warranty
does
not cover parts damaged by misuse.
With the engine stopped and on a level surface, remove the fuel
1.
tank cap and check the fuel level. Refill the tank if the fuel level is
low.
Add fuel to the bottom of the fuel level limit of the fuel tank. Do
2.
not overfill. Wipe up spilled fuel before starting the engine.
25 mm
(1 inch)
MAXIMUM
FUEL
LEVEL
MAXIMUM
FUEL
LEVEL
(strainer type)
(non-strainer type)
FUEL TANK TOP
8
ENGLISH
Oil Level Check
4.
Install the oil filler cap/dipstick and tightensecurely.
Check the engine oil level with the engine stopped and in a level
position.
Remove the oil filler cap/dipstick and wipe it clean.
1.
Insert the oil filler cap/dipstick into the oil filler neck as shown,
2.
but do not screw it in, then remove it to check the oil level.
If the oil level is near or below the lower limit mark on the
3.
dipstick, fill with the recommended oil (see page) to the
8
upper limit mark (bottom edge of the oil fill hole). Do not overfill.
Reinstall the oil filler cap/dipstick.
4.
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.
The Oil Alert
system (applicable types) will automatically stop the
enginebefore 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.
Place a suitable container below the engine to catch the used oil,
1.
then remove the oil filler cap/dipstick, oil drain plug and washer.
OIL FILLER CAP/
DIPSTICK
WASHER
OIL LEVEL
DRAIN PLUG
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.
2 : 1 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 oil to reach the upper limit mark on the
dipstick with the recommended oil.
4.
Screw in the oil filler cap/dipstickand tighten securely.
FILLER CAP/DIPSTICK
UPPER
LIMIT
Allow the used oil to drain completely, then reinstall the oil drain
2.
plug and new washer, and tightenthe 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
containerto your local recycling center or service station for
reclamation. 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 limit mark
(bottom edge of the oil fill hole) on the dipstick with the
recommended oil (see page ).
8
Running the engine 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 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
6 : 1 Reduction Case6 : 1 Reduction Case
FILLER BOLTOIL LEVEL
1.
Remove the oil-level-check bolt
and washer, and see whetherthe
Drain the used oil while the engine is warm. Warm oil drains
quickly and completely.
oil level is at the edge of the bolt
hole.Place a suitable container below the reduction case to catch the
1.
used oil, then remove the filler bolt, oil-level-check bolt and
If the oil level is below the check
2.
washers.
bolt hole, remove the filler bolt
and washer. Add oil until it starts
to flow out the check bolt hole
Drain the used oil completely into the container by tipping the
2.
engine toward the oil-level-check bolt hole.
with the recommended oil (see
page).
9
Please dispose of used motor oil in a manner that is compatible
with the environment. We suggest you take used oil in a sealed
Install the oil-level-check bolt,
3.
filler bolt and washers. Tighten
them securely.
OIL-LEVEL-CHECK BOLT
containerto your local recycling center or service station for
reclamation. Do not throw it in the trash or pour it on the ground
or down a drain.
Oil Change
2 : 1 Reduction Case With Centrifugal Clutch
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, thenremove 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
containerto your local recycling center or service station for
reclamation. Do not throw it in the trash or pour it on the ground
or down a drain.
With the engine in a level position,fill to the upper limit mark on
3.
the dipstick with the recommended oil (see page). To check
9
the oil level, insert and remove the dipstick without screwing it
into the filler hole.
Reductioncase oil capacity:0.50 (0.53 US qt , 0.44 Imp qt)
Running the engine with a low reduction case oil level can cause
reduction case damage.
With the engine in a level position,fill oil until it starts to flow
3.
out the check bolt hole with the recommended oil (see page).
9
Running the engine with a low reduction case oil level can cause
reduction case damage.
Reinstall the oil-level-check bolt, filler boltand new washers,
4.
and tighten them securely.
FILLER BOLT
OIL LEVEL
OIL-LEVEL-CHECK BOLT
AIR CLEANER
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 thanspecified in the MAINTENANCE
SCHEDULE.
Screw in the filler cap/dipstick securely.
4.
UPPER
LIMIT
LOWER LIMIT
10
FILLER CAP/DIPSTICK
DRAIN PLUG
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.
Refer to pagesfor instructions that apply to the air cleaner
−
1211
and filter for your engine type.
ENGLISH
Cleaning
Dual-Filter-Element Types
STANDARD DUAL-FILTERELEMENT TYPE
WING NUT
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.
1.
Remove the wing nut from
the air cleaner cover, and
remove the cover.
2.
Remove the wing nut from
the air filter, and remove the
filter.
Remove the foam filter from
3.
the paper filter.
Inspect both air filter
4.
elements, and replace them if
they are damaged. Always
replace the paper air filter
element at the scheduled
interval (see page ).
SPECIAL PAN SCREW (3)
GROOVE
AIR GUIDE
CYCLONE HOUSING
7
CYCLONE DUAL-FILTER-ELEMENT TYPE
TAB
AIR CLEANER
COVER
WING NUT
PAPER FILTER
ELEMENT
FOAM FILTER
ELEMENT
GASKET
PRECLEANER CAP
WING NUT
AIR CLEANER COVER
WING NUT
PAPER FILTER ELEMENT
FOAM FILTER ELEMENT
GASKET
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 tightenthe wing nut securely.
9.
Oil-Bath Type
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 nonflammable 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.
Empty the used oil from the air cleaner case, wash out any
4.
accumulated dirt with nonflammable solvent, and dry the case.
Fill the air cleaner case to the OIL LEVEL mark with the same oil
5.
that is recommended for the engine (see page ).
Oil capacity:
Reassemble the air cleaner, and tighten the wing nut securely.
6.
AIR CLEANER
COVER
FILTER
ELEMENT
GRID
60 cm
(2.0 US oz , 2.1 Imp oz)
WING NUT
CAP
AIR
CLEANER
CASE
8
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 nonflammable 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
toomuch oil is left in the foam.
CYCLONE TYPE ONLY: Remove the three pan-head screws from
6.
the precleaner cap, then remove the cyclone housing and air
guide. Wash the parts with water, dry them thoroughly, and
reassemble them.
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 precleaner cap.
ENGLISH
OIL LEVEL
11
Low Profile Types
1.
Unsnap the air cleaner cover
clips, remove the air cleaner
cover, and remove the air
filter element.
Wash the elementin a
2.
solution of household
detergent and warm water,
then rinse thoroughly, or
wash in nonflammable or
high flashpoint solvent. Allow
the element to dry thoroughly.
Soak the air filter element in
3.
clean engine oil and squeeze
out the excess oil. The engine
will smoke during initial
startupif too much oil is left
in the element.
Reinstall the air filter element
4.
and the cover.
ELEMENT
CLIP
AIR FILTER ELEMENT
AIR CLEANER COVER
CLIP
Move the fuel valve to the ON position, and check for leaks.
4.
Replace the O-ring if there is any leakage.
SPARK PLUG
Recommended Spark Plugs:
BPR6ES (NGK)
W20EPR-U (DENSO)
The recommended spark plug is the correct heat range for normal
engine operating temperatures.
An incorrect spark plug can cause engine damage.
For good performance, the spark plug must be properly gapped
and free of deposits.
Disconnect the spark plug cap,
1.
and remove any dirt from
SPARK PLUG WRENCH
around the spark plug area.
Remove the spark plug with a
2.
13/16-inch spark plug wrench.
Inspect the spark plug.
3.
Replace it if damaged, badly
fouled, if the sealing washer
is in poor condition, or if the
electrode is worn.
SIDE ELECTRODE
SEDIMENT CUP
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 to the OFF position, then remove the fuel
sediment cup and O-ring.
2.
Wash the sediment cup and O-ring in nonflammable solvent,
and dry them thoroughly.
FUEL VALVE LEVER
O-RING
4.
Measure the spark plug
electrode gap with a wire-
−
0.70 0.80 mm
−
(0.028 0.031 in)
type feeler gauge. Correct the
gap, if necessary, by carefully
bending the side electrode.
The gap should be:
0.70 0.80 mm (0.028 0.031 in)
−−
5.
Install the spark plug carefully,
SEALING
WASHER
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.
7.
When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer.
8.
When reinstalling the original spark plug, tighten1/8 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.
Attach the spark plug cap to the spark plug.
9.
OFF
SEDIMENT CUP
3.
Place the O-ring in the fuel valve, and install the sediment cup.
Tighten the sediment cup securely.
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 three 4 mm screws from the exhaust deflector,
1.
and remove the deflector (applicable types).
2.
Remove the four 5 mm screws from the muffler protector and
remove the muffler protector.
3.
Remove the 4 mm screw from the spark arrester, and remove
the spark arrester from the muffler.
5 mm SCREWS
MUFFLER
PROTECTOR
EXHAUST
DEFLECTOR
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
Gasoline will oxidizeand 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.
4 mm SCREWS
4 mm SCREW
SPARK ARRESTER
Spark Arrester Cleaning & Inspection
1.
Use a brush to remove carbon
deposits from the spark arrester
screen. Be careful not to damage
the screen. Replace the spark
arrester if it has breaks or holes.
2.
Install the spark arrester, muffler protector, and exhaust
SCREEN
deflector in the reverse order of removal.
IDLE SPEED
Adjustment
Start the engine outdoors, and
1.
THROTTLE STOP SCREW
allowittowarmuptooperating
temperature.
Move the throttle lever to its
2.
minimum position.
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
whetherthe fuel tank is partially or completely filled. The air in a
partially filled fuel tank promotesfuel deterioration. Very warm
storage temperatures accelerate fuel deterioration. Fuel 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
.
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 promotefuel
deterioration during storage. If you keep a container of gasoline
for refueling, be sure that it contains only fresh gasoline.
1.
Add gasoline stabilizer following the manufacturer’sinstructions.
2.
After adding a gasoline stabilizer, run the engine outdoors for 10
minutesto be sure that treated gasoline has replaced the
untreated gasoline in the carburetor.
3.
Stop the engine.
Turn the throttle stop screw to
3.
obtain the standard idle speed.
Standardidle speed:
1,400rpm
+
200
−
150
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.
Stop engine and keep heat, sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.
1.
Place an approved gasoline container below the carburetor, and
use a funnel to avoid spilling fuel.
2.
Remove the carburetor drain bolt and gasket. Remove the
sedimentcup and O-ring, then move the fuel valve lever to the
ON position.
FUEL VALVE LEVER
O-RING
ON
GASKET
DRAIN BOLT
SEDIMENT CUP
3.
After all the fuel has drained into the container, reinstall the
drain bolt, gasket, sediment cup and O-ring. Tighten the drain
bolt and sediment cup securely.
Engine Oil
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.
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 gasolinefor 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.
1.
Change the engine oil (see page ).
2.
Remove the spark plug (see page).Keep the engine level when transportingto reduce the possibility
9
TRANSPORTING
12
of fuel leakage. Turn the fuel valve to the OFF position (see
3.
Pour a tablespoon 5 10 cm
−−
(5 10 cc) of clean engine oil into
5
page).
the cylinder.
4.
Pull the starter rope several times to distributethe oil in the
cylinder.
5.
Reinstall the spark plug.
6.
Pull the starter rope 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 rope gently.
Align notch on pulley with hole at top of cover.
14
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.
Check engine
3.
oil level.
Check fuel.
4.
Remove and
5.
inspect spark
plug.
Take engine to
6.
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
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.
Remove the 612 mm screw from the rear cover of the engine
1.
×
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 612 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 CauseCorrection
Filter element(s)
restricted.
Bad fuel; engine
stored without
treatingor
draining
Clean or replace
filter element(s)
(p. 11 12).
−
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 & CONSUMER INFORMATION
Remote Control Linkage
TECHNICAL INFORMATION
Serial Number Location
Record the engine serial
number, type and purchase
date in the space below. You
will need this information when
ordering parts and when
making technical or warranty
inquiries.
Battery Connections for Electric Starter(applicable types)
Use a 12-volt battery with an ampere-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 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
optionalcable attachment. The following illustrations show
installationexamples 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
THROTTLE LEVER
FRICTION NUT
Flexible wire core
mounting
WIRE
5mm
CIRCLIP
Solid wire core
mounting
REMOTE CHOKE LINKAGE
4 mm SCREW
WIRE HOLDER
THROTTLE
LEVER
SPRING
OPTIONAL
A battery can explode if you do not follow the correct
procedure, seriously injuring anyone nearby.
Keep all sparks, open flames, and smokingmaterials
away from the battery.
1.
Connect the battery positive ( ) cable to the starter solenoid
+
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
POSITIVE ( ) BATTERY CABLE
+
WIRE HOLDER
CHOKE LEVER
Carburetor Modifications for High Altitude Operation
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.
16
ENGLISH
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.
Oxygenated Fuels
Some conventional gasolines are being blended with alcohol or an
ether compound. These gasolines are collectively referred to as
oxygenatedfuels. To meet clean air standards, some areas of the
United States and Canada use oxygenatedfuels to help reduce
emissions.
If you use oxygenated fuel, be sure it is unleaded and meets the
minimum octane rating requirements.
Before using an oxygenated fuel, try to confirm the fuel’s contents.
Some states/provinces require this information to be posted on
the pump.
Emission Control System Information
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 lean carburetorsettings and other systems to
reduce the emissions of carbon monoxide, oxides of nitrogen, and
hydrocarbons.
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
Tamperingwith or altering the emission control system may
increase emissions beyond the legal limit. Among those acts that
constitute tampering are:
The following are the EPA approved percentages of oxygenates:
ETHANOL
(ethyl or grain alcohol) 10% by volume
You may use gasoline containing up to 10%
ethanol by volume. Gasoline containing
ethanol may be marketed under the name
Gasohol.
MTBE
(methyltertiary butyl ether) 15% by volume
You may use gasoline containing up to 15%
MTBE by volume.
METHANOL
(methyl or wood alcohol) 5% by volume
You may use gasoline containing up to 5%
methanolby volume as long as it also
contains cosolvents and corrosion inhibitors
to protect the fuel system. Gasoline
containing more than 5% methanol by
volume may cause starting and/or
performance problems. It may also damage
metal, rubber, and plastic parts of your fuel
system.
If you notice any undesirable operating symptoms, try another
service station or switch to another brand of gasoline.
Fuel system damage or performance problems resulting from the
use of an oxygenated fuel containingmore than the percentages
of oxygenates mentioned above are not covered under the
Distributor’s Limited Warranty
.
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 and
Canadian emission regulations. We recommend the use of
genuine Honda parts whenever you have maintenancedone.
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
Air Index
Specifications
An Air Index Information hang tag/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 intendedto provide you with
informationrelatingthe engine’s emission durabilityperiod. 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 TermApplicable to Emissions Durability
Period
Moderate
Intermediate
Extended
50 hours [0 65 cm
125 hours [greater than 65 cm
125 hours [0 65 cm
250 hours [greater than 65 cm
300 hours [0 65 cm
500 hours [greater than 65 cm
−−
(0 65 cc)]
(65 cc)]
−−
(0 65 cc)]
(65 cc)]
−−
(0 65 cc)]
(65 cc)]
The Air Index Information hang tag/label must remain on the
engine until it is sold. Remove the hang tag before operating the
engine.
GX120
(PTO shaft type S)
LengthWidth
××
Height
Dry weight
Engine type
Displacement
[BoreStroke]
×
Max. output
Max. torque
Engine oil capacity
Fuel tank capacity
Fuel consumption
Coolingsystem
Ignition system
PTO shaft rotation
GX160
(PTO shaft type S)
LengthWidth
××
Height
Dry weight
Engine type
Displacement
[BoreStroke]
×
Max. output
Max. torque
Engine oil capacity
Fuel tank capacity
Fuel consumption
Coolingsystem
Ignition system
PTO shaft rotation
297341318 mm
××
(11.713.412.5in)
××
13.0 kg (28.7 lbs)
4-stroke, overhead valve, single cylinder
119 cm
××
[6042mm(2.41.7in)]
(7.3 cu-in)
2.9 kW (4.0 PS, 4.0 bhp) at 3,600 rpm
7.4 N·m (0.75 kgf·m, 5.4 lbf·ft) at
2,500 rpm
0.60
(0.63 US qt , 0.53 Imp qt)
2.5
(0.66 US gal , 0.55 Imp gal)
313 g/kWh (230 g/PSh, 0.51 lb/hph)
Forced air
Transistorized magneto
Counterclockwise
304362335 mm
××
(12.014.313.2in)
××
15.0 kg (33.1 lbs)
4-stroke, overhead valve, single cylinder
163 cm
××
[6845mm(2.71.8in)]
(9.9 cu-in)
4.0 kW (5.5 PS, 5.5 bhp) at 3,600 rpm
10.8 N·m (1.1 kgf·m, 8.0 lbf·ft) at
2,500 rpm
0.60
(0.63 US qt , 0.53 Imp qt)
3.6
(0.95 US gal , 0.79 Imp gal)
313 g/kWh (230 g/PSh, 0.51 lb/hph)
Forced air
Transistorized magneto
Counterclockwise
GX200
(PTO shaft type S)
LengthWidth
××
Height
Dry weight
Engine type
Displacement
[BoreStroke]
×
Max. output
Max. torque
Engine oil capacity
Fuel tank capacity
Fuel consumption