owner’s manual - american honda motor company · owner’s manual gx270・gx390 lpg-fueled engine...
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31ZK660100X31-ZK6-6010 2003 Honda Motor Co., Ltd. -All Rights Reserved
K1:GX390300.2003.10
Printed in Japan
Owner’s ManualGX270・GX390
LPG-Fueled Engine
Black DIC 157
A H H C英 NEM3
GX270 AH O/M 31ZK6601GX270 AH O/M 31ZK6601
Keep this owner’s manual handy, so you can refer to it at any time.This owner’s manual is considered a permanent part of the engine andshould remain with the engine if resold.
The information and specifications included in this publication were ineffect at the time of approval for printing. Illustrations are based on theGX270 LPG. Honda Motor Co., Ltd. reserves the right, however, todiscontinue or change specifications or design at any time withoutnotice and without incurring any obligation whatever. No part of thispublication may be reproduced without written permission.
The engine exhaust from this productcontains chemicals known to the State
of California to cause cancer, birthdefects or other reproductive harm.
01/11/15 10:56:30 31ZK6600_001
1
INTRODUCTION
Congratulations on your selection of a Honda engine. We are certainyou will be pleased with your purchase of one of the finest engines onthe market.
We want to help you get the best results from your new engine and tooperate it safely. This manual contains the information on how to dothat; please read it carefully.
As you read this manual, you will find information preceded by asymbol. That information is intended to help you avoid
damage to your engine, other property, or the environment.
We suggest you read the warranty policy to fully understand itscoverage and your responsibilities of ownership. The warranty policyis a separate document that should have been given to you by yourdealer.
When your engine needs scheduled maintenance, keep in mind thatyour Honda servicing dealer is specially trained in servicing Hondaengines. Your Honda servicing dealer is dedicated to your satisfactionand will be pleased to answer your questions and concerns.
Best Wishes,Honda Motor Co., Ltd.
01/11/15 10:56:38 31ZK6600_002
2
INTRODUCTION
A FEW WORDS ABOUT SAFETY
Safety Labels
Safety Messages
Safety Headings
Safety Section
Instructions
Your safety and the safety of others are very important. And using thisengine safely is an important responsibility.
To help you make informed decisions about safety, we have providedoperating procedures and other information on labels and in thismanual. This information alerts you to potential hazards that couldhurt you or others.
Of course, it is not practical or possible to warn you about all thehazards associated with operating or maintaining an engine. You mustuse your own good judgment.
You will find important safety information in a variety of forms,including:
–– on the engine.
–– preceded by a safety alert symbol and oneof three signal words, DANGER, WARNING, or CAUTION.
These signal words mean:
You WILL be KILLED or SERIOUSLY HURT ifyou don’t follow instructions.
You CAN be KILLED or SERIOUSLY HURT ifyou don’t follow instructions.
You CAN be HURT if you don’t followinstructions.
–– such as IMPORTANT SAFETY INFORMATION.
–– such as ENGINE SAFETY.
–– how to use this engine correctly and safely.
This entire book is filled with important safety information –– pleaseread it carefully.
01/11/15 10:56:50 31ZK6600_003
3
CONTENTS
.......................................................................................ENGINE SAFETY . 5................................................IMPORTANT SAFETY INFORMATION . 5
........................................................................CONTROLS & FEATURES . 7............................................COMPONENT & CONTROL LOCATIONS . 7
............................................................................................CONTROLS . 8....................................................................................Engine Switch . 8
.......................................................................................Choke Lever . 9..................................................................................Throttle Lever . 10
...........................................................................Recoil Starter Grip . 10...........................................................................................FEATURES . 11
.................................Oil Alert System (applicable engine types) . 11
.............................................................................BEFORE OPERATION . 12.....................................................IS YOUR ENGINE READY TO GO? . 12
..................................Check the General Condition of the Engine . 12.............................................................................Check the Engine . 13
............................Check the Equipment Powered by This Engine . 13
............................................................................................OPERATION . 14...................................................SAFE OPERATING PRECAUTIONS . 14
....................................................................STARTING THE ENGINE . 14
....................................................................STOPPING THE ENGINE . 18...................................................................SETTING ENGINE SPEED . 19
.....................................................SERVICING YOUR HONDA ENGINE . 20............................................THE IMPORTANCE OF MAINTENANCE . 20
....................................................................MAINTENANCE SAFETY . 21..............................................................MAINTENANCE SCHEDULE . 22.............................................................FUEL RECOMMENDATIONS . 23
................................................................ENGINE OIL LEVEL CHECK . 24.........................................................................ENGINE OIL CHANGE . 25
..................................................ENGINE OIL RECOMMENDATIONS . 26....................................................................AIR FILTER INSPECTION . 27
......................................................................AIR CLEANER SERVICE . 28.......................................................................SPARK PLUG SERVICE . 30
...............................................................IDLE SPEED ADJUSTMENT . 31.....................................SPARK ARRESTER SERVICE (optional part) . 32
01/11/15 10:56:54 31ZK6600_004
4
CONTENTS
.........................................................HELPFUL TIPS & SUGGESTIONS . 33...................................................................STORING YOUR ENGINE . 33
........................................................................Storage Preparation . 33
........................................................................Storage Precautions . 34...................................................................Removal From Storage . 35
.................................................................................TRANSPORTING . 36
.....................................TAKING CARE OF UNEXPECTED PROBLEMS . 37.................................................................ENGINE WILL NOT START . 37
.....................................................................ENGINE LACKS POWER . 37
........................................TECHNICAL & CONSUMER INFORMATION . 38...............................................................TECHNICAL INFORMATION . 38
..................................................................Serial Number Location . 38.................................................................Remote Control Linkage . 39
...................Carburetor Modification for High Altitude Operation . 40..........................................Emission Control System Information . 41
...........................................................................................Air Index . 43..................................................................................Specifications . 44
...............................................................................Wiring Diagram . 45..............................................................CONSUMER INFORMATION . 46
.........................................................................Honda Publications . 46........................................................Warranty Service Information . 47
............................QUICK REFERENCE INFORMATION . Inside back cover
01/11/15 10:56:57 31ZK6600_005
5
ENGINE SAFETY
IMPORTANT SAFETY INFORMATION
Owner Responsibilities
Refuel With Care
Hot Exhaust
Most accidents with engines can be prevented if you follow allinstructions in this manual and on the engine. Some of the mostcommon hazards are discussed below, along with the best way toprotect yourself and others.
Honda engines are designed to give safe and dependable service ifoperated according to instructions. Read and understand thisowner’s manual before operating the engine. Failure to do so couldresult in personal injury or equipment damage.
Know how to stop the engine quickly, and understand the operationof all controls. Never permit anyone to operate the engine withoutproper instructions.
Do not allow children to operate the engine. Keep children and petsaway from the area of operation.
LPG is extremely flammable, and LPG can explode. Refuel outdoors, ina well-ventilated area, with the engine stopped. Never smoke near LPG,and keep other flames and sparks away.
The muffler becomes very hot during operation and remains hot fora while after stopping the engine. Be careful not to touch the mufflerwhile it is hot. Let the engine cool before storing it indoors.
To prevent fire hazards and to provide adequate ventilation forstationary equipment applications, keep the engine at least 3 feet (1meter) away from building walls and other equipment duringoperation. Do not place flammable objects close to the engine.
01/11/15 10:57:08 31ZK6600_006
6
ENGINE SAFETY
Other Equipment
Carbon Monoxide Hazard
Review the instructions provided with the equipment powered by thisengine for any additional safety precautions that should be observedin conjunction with engine startup, shutdown, or operation, orprotective apparel that may be needed to operate the equipment.
Exhaust gas contains poisonous carbon monoxide. Avoid inhalation ofexhaust gas. Never run the engine in a closed garage or confined area.
01/11/15 10:57:13 31ZK6600_007
7
COMPONENT & CONTROL LOCATIONS
CONTROLS & FEATURES
MUFFLER AIR CLEANER
THROTTLE LEVER
RECOIL STARTER
SPARK PLUG
OIL DRAIN PLUG
ENGINE SWITCH
CHOKE LEVER
OIL FILLER CAP
STARTER GRIP
01/11/15 10:57:19 31ZK6600_008
8
CONTROLS & FEATURES
CONTROLS
Engine Switch
ENGINE SWITCH
OFF
ON
The engine switch enables and disables the ignition system.
The engine switch must be in the ON position for the engine to run.
Turning the engine switch to the OFF position stops the engine.
01/11/15 10:57:27 31ZK6600_009
9
CONTROLS & FEATURES
Choke Lever
CHOKE LEVER
OOPPEENNCCLLOOSSEEDD
The choke lever opens and closes the choke valve in the carburetor.
Some engine applications use a remotely-mounted choke controlrather than the engine-mounted choke lever shown here.
The CLOSED position creates a vacuum to help the LPG to flow intothe engine during starting.
The OPEN position removes the vacuum after the engine has startedand can produced its own vacuum.
01/11/15 10:57:34 31ZK6600_010
10
CONTROLS & FEATURES
Throttle Lever
Recoil Starter Grip
THROTTLE LEVER
SLOWFFAASSTT
STARTER GRIP
The throttle lever controls engine speed.
Moving the throttle lever in the directions shown makes the enginerun faster or slower.
Some engine applications use a remotely-mounted throttle controlrather than the engine-mounted throttle lever shown here.
Pulling the starter grip operates the recoil starter to crank the engine.
01/11/15 10:57:42 31ZK6600_011
11
CONTROLS & FEATURES
FEATURES
Oil Alert System (applicable engine types)
If the engine stops and will not restart, check the engine oil level (page) before troubleshooting in other areas.
The Oil Alert system is designed to prevent engine damage causedby an insufficient amount of oil in the crankcase. Before the oil level inthe crankcase can fall below a safe limit, the Oil Alert system willautomatically stop the engine (the ignition switch will remain in theON position).
24
01/11/15 10:57:47 31ZK6600_012
12
BEFORE OPERATION
IS YOUR ENGINE READY TO GO?
Check the General Condition of the Engine
For your safety, and to maximize the service life of your equipment, itis very important to take a few moments before you operate theengine to check its condition. Be sure to take care of any problem youfind, or have your servicing dealer correct it, before you operate theengine.
Improperly maintaining this engine,or failing to correct a problembefore operation, could cause amalfunction in which you could beseriously injured.
Always perform a preoperationinspection before each operation,and correct any problem.
Before beginning your preoperation checks, be sure the engine is leveland the engine switch is in the OFF position.
Remove any excessive dirt or debris, especially around the mufflerand recoil starter.
Look for signs of damage.
Check that all shields and covers are in place, and all nuts, bolts, andscrews are tightened.
Look and smell around and underneath the engine for signs of oil orLPG leaks.
01/11/15 10:57:56 31ZK6600_013
13
BEFORE OPERATION
Check the Engine
Check the Equipment Powered by This Engine
Check the engine oil level (see page ). Running the engine with alow oil level can cause engine damage.
The Oil Alert system (applicable engine types) will automaticallystop the engine before the oil level falls below safe limits. However,to avoid the inconvenience of an unexpected shutdown, alwayscheck the engine oil level before startup.
Check the air filter (see page ). A dirty air filter will restrict air flowto the carburetor, reducing engine performance.
Review the instructions provided with the equipment powered by thisengine for any precautions and procedures that should be followedbefore engine startup.
24
27
01/11/15 10:58:03 31ZK6600_014
14
OPERATION
SAFE OPERATING PRECAUTIONS
STARTING THE ENGINE
Before operating the engine for the first time, please review theIMPORTANT SAFETY INFORMATION on page and the chapter titledBEFORE OPERATION.
Review the instructions provided with the equipment powered by thisengine for any safety precautions that should be observed inconjunction with engine startup, shutdown, or operation.
Carbon monoxide gas is toxic.Breathing it can causeunconsciousness and even kill you.
Avoid any areas or actions thatexpose you to carbon monoxide.
Turn the fuel valve to the OPEN or ON position at the source beforeattempting to start the engine.
5
1.
01/11/15 10:58:11 31ZK6600_015
15
OPERATION
CHOKE LEVER
THROTTLE LEVER
SSLLOOWW
CCLLOOSSEEDD
Move the choke lever to the CLOSED position.
Always use the choke when starting the engine.
Some engine applications use a remotely-mounted choke controlrather than the engine-mounted choke lever shown here.
Move the throttle lever away from the SLOW position, about 1/3 ofthe way toward the FAST position.
Some engine applications use a remotely-mounted throttle controlrather than the engine-mounted throttle lever shown here.
2.
3.
01/11/15 10:58:17 31ZK6600_016
16
OPERATION
ON
ENGINE SWITCH
STARTER GRIP
Turn the engine switch to the ON position.
Operate the starter.
Pull the starter grip lightly until you feel resistance, then pull briskly.Return the starter grip gently.
4.
5.
01/11/15 10:58:23 31ZK6600_017
17
OPERATION
CHOKE LEVER
OPEN
Move the choke lever to the OPEN position after the engine hasstarted.
6.
01/11/15 10:58:27 31ZK6600_018
18
OPERATION
STOPPING THE ENGINE
THROTTLE LEVER
ENGINE SWITCH
OFF
SLOW
To stop the engine in an emergency, simply turn the engine switch tothe OFF position. Under normal conditions, use the followingprocedure.
Move the throttle lever to the SLOW position.
Some engine applications use a remotely-mounted throttle controlrather than the engine-mounted throttle lever shown here.
Turn the fuel valve to the CLOSED or OFF position at the source.
Turn the engine switch to the OFF position.
1.
2.
3.
01/11/15 10:58:36 31ZK6600_019
19
OPERATION
SETTING ENGINE SPEED
THROTTLE LEVER
SLOWFFAASSTT
Position the throttle lever for the desired engine speed.
Some engine applications use a remotely-mounted throttle controlrather than the engine-mounted throttle lever shown here.
For engine speed recommendations, refer to the instructions providedwith the equipment powered by this engine.
01/11/15 10:58:42 31ZK6600_020
20
SERVICING YOUR ENGINE
THE IMPORTANCE OF MAINTENANCE
Maintenance, replacement or repair of emission control devices andsystems may be done by any engine repair establishment orindividual, using parts that are ‘‘certified’’ to EPA standards.
Good maintenance is essential for safe, economical, and trouble-freeoperation. It will also help reduce air pollution.
Improperly maintaining this engine,or failure to correct a problembefore operation, can cause amalfunction in which you can beseriously hurt or killed.
Always follow the inspection andmaintenance recommendations andschedules in this owner’s manual.
To help you properly care for your engine, the following pages includea maintenance schedule, routine inspection procedures, and simplemaintenance procedures using basic hand tools. Other service tasksthat are more difficult, or require special tools, are best handled byprofessionals and are normally performed by a Honda technician orother qualified mechanic.
The maintenance schedule applies to normal operating conditions. Ifyou operate your engine under unusual conditions, such as sustainedhigh-load or high-temperature operation, or use in unusually wet ordusty conditions, consult your servicing dealer for recommendationsapplicable to your individual needs and use.
01/11/15 10:58:49 31ZK6600_021
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-
-
21
SERVICING YOUR ENGINE
MAINTENANCE SAFETY
Safety Precautions
Carbon monoxide poisoning from engine exhaust.
Burns from hot parts.
Injury from moving parts.
Some of the most important safety precautions follow. However, wecannot warn you of every conceivable hazard that can arise inperforming maintenance. Only you can decide whether or not youshould perform a given task.
Failure to properly followmaintenance instructions andprecautions can cause you to beseriously hurt or killed.
Always follow the procedures andprecautions in the owner’s manual.
Make sure the engine is off before you begin any maintenance orrepairs. This will eliminate several potential hazards:
Be sure there is adequate ventilation whenever you operate theengine.
Let the engine and exhaust system cool before touching.
Do not run the engine unless instructed to do so.
Read the instructions before you begin, and make sure you have thetools and skills required.
Remember that your servicing dealer knows your engine best and isfully equipped to maintain and repair it.
To ensure the best quality and reliability, use only new, genuineHonda parts or their equivalents for repair and replacement.
To reduce the possibility of fire or explosion, be careful whenworking around LPG. Keep cigarettes, sparks and flames away fromall fuel-related parts.
01/11/15 10:59:01 31ZK6600_022
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22
SERVICING YOUR ENGINE
MAINTENANCE SCHEDULE
For commercial use, log hours of operation to determine propermaintenance intervals.
These items should be serviced by your servicing dealer, unlessyou have the proper tools and are mechanically proficient. Referto Honda shop manual for service procedures.
Service more frequently when used in dusty areas.
Replace the paper element type only.
Emission-related items.
(1)
(2)
(3)
( )
Engine oil
(LPG model)
Reduction gear oil
(Equipped model)
Air filter
Sediment cup
Spark plug
Spark arrester
(optional parts)
Idle speed
Valve clearance
Combustion chamber
Fuel tube (LPG model)
Fuel tube
Each
useITEM
First
month
or
20 Hrs.
Every
3 months
or
50 Hrs.
Every
6 months
or
100 Hrs.
Refer
to
page
Check level
Change
Clean
Replace
Check-adjust
(2)
(2)
(1)
24
25
27
28
30
32
31
Every
year
or
200 Hrs.
Check
Clean
Clean
Replace
Clean
Check
Check level
Change
REGULAR SERVICE PERIOD (3)
After every 250 Hrs (2)
Check-adjust
Check-adjust
Perform at every indicated
month or operating hour interval,
whichever comes first.
( )
Check Every 2 years (Replace if necessary) (2)
02/07/24 11:39:38 31ZK6600_023
23
SERVICING YOUR ENGINE
FUEL RECOMMENDATIONS
Use LPG with a propane content of 95% or higher.
This engine is certified to operate on LPG only.
Occasionally you may hear a light ‘‘spark knock’’ or ‘‘pinging’’(metallic rapping noise) while operating under heavy loads. This is nocause for concern.
If spark knock or pinging occurs at a steady engine speed, undernormal load, change brands of LPG. If spark knock or pinging persists,see an authorized Honda servicing dealer.
Running the engine with persistent spark knock or pinging can causeengine damage.
Running the engine with persistent spark knock or pinging is misuse,and the Distributor’s Limited Warranty does not cover parts damagedby misuse.
01/11/15 10:59:22 31ZK6600_024
24
SERVICING YOUR ENGINE
ENGINE OIL LEVEL CHECK
LOWER LIMIT
UPPER LIMIT
FILLER CAP/DIPSTICK
Check the engine oil level with the engine stopped and in a levelposition.
Running the engine with a low oil level can cause engine damage.
The Oil Alert system (applicable engine types) will automatically stopthe engine before the oil level falls below safe limit. However, to avoidthe inconvenience of an unexpected shutdown, always check theengine oil level before startup.
Remove the filler cap/dipstick and wipe it clean.
Insert and remove the dipstick without screwing it into the filler neck.Check the oil level shown on the dipstick.
If the oil level is low, fill to the edge of the oil filler hole with therecommended oil (see page 26).
Screw in the filler cap/dipstick securely.
1.
2.
3.
4.
01/11/15 10:59:30 31ZK6600_025
25
SERVICING YOUR ENGINE
ENGINE OIL CHANGE
FILLER CAP/DIPSTICK
OIL LEVEL
DRAIN PLUG
Drain the used oil while the engine is warm. Warm oil drains quicklyand completely.
1.16 US qt (1.10 )
Running the engine with a low oil level can cause engine damage.
The Oil Alert system (applicable engine types) will automaticallystop 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.
Place a suitable container below the engine to catch the used oil,then remove the filler cap/dipstick and the drain plug.
Allow the used oil to drain completely, then reinstall the drain plug,and tighten it securely.
Please dispose of used motor oil in a manner that is compatible withthe environment. We suggest you take used oil in a sealed containerto your local recycling center or service station for reclamation. Donot throw it in the trash, pour it on the ground, or down a drain.
With the engine in a level position, fill to the outer edge of the oilfiller hole with the recommended oil (see page 26).
Screw in the filler cap/dipstick securely.
1.
2.
Engine oil capacity:
3.
4.
02/07/24 11:39:47 31ZK6600_026
26
SERVICING YOUR ENGINE
ENGINE OIL RECOMMENDATIONS
Oil is a major factor affecting performance and service life. Use4-stroke automotive detergent oil that is designed for enginesoperating on LPG.
For operation in temperatures below 32°F (0°C), 5W-30 synthetic oilmay be used for easier starting. Do not use 5W-30 synthetic oil whenthe air temperature is above 32°F (0°C).
Do not use multigrade mineral-based oils. The use of multigrademineral-based oils may result in premature engine wear and/ordamage.
SAE 30 (API service classification SJ) is recommended for general use.The following are examples of oils that meet Honda’s requirements forLPG-fueled engines:
Pennzoil HD 30Valvoline HPO 30Castrol HD 30
01/11/15 10:59:46 31ZK6600_027
27
SERVICING YOUR ENGINE
AIR FILTER INSPECTION
PAPERFILTERELEMENT
FOAMFILTERELEMENT
Remove the air cleaner cover and inspect the filter elements. Clean orreplace dirty filter elements. Always replace damaged filter elements.
Refer to page for instructions that apply to the air cleaner and filterservice.
28
01/11/15 10:59:52 31ZK6600_028
28
SERVICING YOUR ENGINE
AIR CLEANER SERVICE
AIRCLEANERCOVER
PAPERFILTERELEMENT
FOAMFILTERELEMENT
GASKET
WINGNUTS
A dirty air filter will restrict air flow to the carburetor, reducing engineperformance. If you operate the engine in very dusty areas, clean theair filter more often than specified in the MAINTENANCE SCHEDULE.
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 typeof damage is not covered by the Distributor’s Limited Warranty.
Remove the wing nut from theair cleaner cover, and removethe cover.
Remove the wing nut from theair filter, and remove the filter.
Remove the foam filter from thepaper filter.
Inspect both air filter elements,and replace them if they aredamaged. Always replace thepaper air filter element at thescheduled interval (see page22).
Clean the air filter elements ifthey are to be reused.
1.
2.
3.
4.
5.
01/11/15 10:59:58 31ZK6600_029
29
SERVICING YOUR ENGINE
Wipe dirt from the inside of the air cleaner base and cover, using amoist rag. Be careful to prevent dirt from entering the air duct thatleads to the carburetor.
Place the foam air filter element over the paper element, andreinstall the assembled air filter. Be sure the gasket is in placebeneath the air filter. Tighten the air filter wing nut securely.
Install the air cleaner cover, and tighten the cover wing nut securely.
Paper air filter element: Tap the filter element several times on a hardsurface to remove dirt, or blow compressed air [not exceeding 30 psi(207 kPa, 2.1 kgf/cm )] 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 todry thoroughly. Or clean in nonflammable solvent and allow to dry.Dip the filter element in clean engine oil, then squeeze out all excessoil. The engine will smoke when started if too much oil is left in thefoam.
6.
7.
8.
01/11/15 11:00:03 31ZK6600_030
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30
SERVICING YOUR ENGINE
SPARK PLUG SERVICE
SPARK PLUG WRENCH
0.028 0.031 in
(0.70 0.80 mm)
BPR6ESW20EPR-U
An incorrect spark plug can cause engine damage.
Disconnect the spark plug cap, and remove any dirt from around thespark plug area.
Remove the spark plug with a 13/16-inch spark plug wrench.
Inspect the spark plug. Replace itif the electrodes are worn, or if theinsulator is cracked or chipped.Clean the spark plug with a wirebrush if you are going to reuse it.
Measure the spark plug electrodegap with a suitable gauge. Thegap shou ld be 0.028 0.031 in(0.70 0.80 mm). Correct the gap,if necessary, by carefully bendingthe side electrode.
Install the spark plug carefully, byhand, to avoid cross-threading.
1.
2.
Recommended spark plugs: (NGK)
3.
4.
5.
(DENSO)
01/11/15 11:00:12 31ZK6600_031
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+-
31
SERVICING YOUR ENGINE
IDLE SPEED ADJUSTMENT
THROTTLE STOP SCREW
A loose spark plug can overheat and damage the engine.Overtightening the spark plug can damage the threads in thecylinder head.
After the spark plug seats, tighten with a 13/16-inch spark plugwrench to compress the washer.
If reinstalling the used spark plug, tighten 1/8 1/4 turn after thespark plug seats.
If installing a new spark plug, tighten 1/2 turn after the spark plugseats.
Attach the spark plug cap.
Start the engine outdoors, and allow it to warm up to operatingtemperature.
Move the throttle lever to its slowest position.
Turn the throttle stop screw to obtain the standard idle speed.
6.
7.
1.
2.
3.
Standard idle speed: 1,400 rpm200150
01/11/15 11:00:20 31ZK6600_032
32
SERVICING YOUR ENGINE
SPARK ARRESTER SERVICE (optional equipment)
5 mm SCREWS
4 mm SCREW
4 mmSCREWS
8 mm NUTS MUFFLERSPARK ARRESTER
EXHAUSTDEFLECTOR
SPARKARRESTER
MUFFLERPROTECTOR
SCREEN
Your engine is not factory-equipped with a spark arrester. In someareas, it is illegal to operate an engine without a spark arrester. Checklocal laws and regulations. A spark arrester is available fromauthorized Honda servicing dealers.
The spark arrester must be serviced every 100 hours to keep itfunctioning as designed.
If the engine has been running, the muffler will be very hot. Allow themuffler to cool before servicing the spark arrester.
Remove the two 8 mm nuts and remove the muffler from thecylinder.Remove the three 4 mm screws from the exhaust deflector, andremove the deflector.Remove the four 5 mm screws from the muffler protector andremove the muffler protector.Remove the 4 mm screws from the spark arrester, and remove thespark arrester from the muffler.
Use a brush to remove carbon depositsfrom the spark arrester screen. Becareful to avoid damaging the screen.The spark arrester must be free ofbreaks and holes. Replace the sparkarrester if it is damaged.Install the spark arrester, muffler protector, exhaust deflector, andmuffler in the reverse order of disassembly.
1.
2.
3.
4.
5.
6.
01/11/15 11:00:33 31ZK6600_033
33
HELPFUL TIPS & SUGGESTIONS
STORING YOUR ENGINE
Storage Preparation
Cleaning
Proper storage preparation is essential for keeping your enginetroublefree and looking good. The following steps will help to keeprust and corrosion from impairing your engine’s function andappearance, and will make the engine easier to start when you use itagain.
If the engine has been running, allow it to cool for at least half an hourbefore cleaning. Clean all exterior surfaces, touch up any damagedpaint, and coat other areas that may rust with a light film of oil.
Using a garden hose or pressure washing equipment can forcewater into the air cleaner or muffler opening. Water in the air cleanerwill soak the air filter, and water that passes through the air filter ormuffler can enter the cylinder, causing damage.
Water contacting a hot engine can cause damage. If the engine hasbeen running, allow it to cool for at least half an hour beforewashing.
01/11/15 11:00:40 31ZK6600_034
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34
HELPFUL TIPS & SUGGESTIONS
Engine Oil
Storage Precautions
Engine Cylinder
Align notch on pulleywith hole at top of cover.
Select a well-ventilated storage area away from any appliance thatoperates with a flame, such as a furnace, water heater, or clothes dryer.Also avoid any area with a spark-producing electric motor, or wherepower tools are operated.
If possible, avoid storage areas with high humidity, because thatpromotes rust and corrosion.
Leave the fuel valve lever in the OFF position at the source to reducethe possibility of fuel leakage.
Remove the spark plug (see page 30).
Pour a tablespoon (5 10 cc) of clean engine oil into the cylinder.
Pull the starter rope several times to disribute the oil in the cylinder.
Reinstall the spark plug.
Pull the starter rope slowly until resistance is felt and the notch onthe starter pulley aligns with the hole at the top of the recoil startercover. This will close the valves so moisture cannot enter the enginecylinder. Return the starter rope gently.
Change the engine oil (see page 25).1.
2.
3.
4.
5.
1.
01/11/15 11:00:50 31ZK6600_035
35
HELPFUL TIPS & SUGGESTIONS
Removal From Storage
With the engine and exhaust system cool, cover the engine to keep outdust. A hot engine and exhaust system can ignite or melt somematerials. Do not use sheet plastic as a dust cover. A nonporous coverwill trap moisture around the engine, promoting rust and corrosion.
Position the equipment so the engine is level. Tilting can cause oilleakage.
Check your engine as described in the BEFORE OPERATION chapter ofthis manual.
If the cylinder was coated with oil during storage preparation, theengine may smoke briefly at startup. This is normal.
01/11/15 11:00:56 31ZK6600_036
36
HELPFUL TIPS & SUGGESTIONS
TRANSPORTING
If the engine has been running, allow it to cool for at least 15 minutesbefore loading the engine-powered equipment on the transportvehicle. A hot engine and exhaust system can burn you and can ignitesome materials.
Keep the engine level when transporting to reduce the possibility offuel leakage. Turn the fuel valve OFF at the source.
01/11/15 11:01:01 31ZK6600_037
37
TAKING CARE OF UNEXPECTED PROBLEMS
ENGINE LACKS
POWER
Possible Cause Correction
ENGINE WILL NOT
START
Possible Cause Correction
Fuel valve OFF.Choke OPEN.Engine switch OFF.
Out of fuel.Spark plug faulty,fouled, or improperlygapped.Spark plug wet withfuel (flooded engine).
Carburetor malfunction,ignition malfunction,valves stuck, etc.
Check controlpositions.
Check fuel.Remove and inspectspark plug.
Take engine to anauthorized Hondaservicing dealer, orrefer to shop manual.
Check air filter.
Take engine to anauthorized Hondaservicing dealer, orrefer to shop manual.
Filter element(s)clogged.Carburetor malfunction,ignition malfunction,valves stuck, etc.
Clean or replace filterelement(s) (p. 28).Replace or repair faultycomponents asnecessary.
OPEN valve.Move lever to CLOSED.Turn engine switch toON.Refuel.Clean, gap, or replacespark plug (p. 30).
Dry and reinstall sparkplug. Start engine withthrottle lever in FASTposition.Replace or repair faultycomponents asnecessary.
1.
2.3.
4.
1.
2.
01/11/15 11:01:13 31ZK6600_038
38
TECHNICAL & CONSUMER INFORMATION
TECHNICAL INFORMATION
Serial Number Location
SERIAL NUMBER& ENGINE TYPE
Engine serial number:
Record the engine serial number in the space below. You will need thisserial number when ordering parts, and when making technical orwarranty inquires (see page ).47
01/11/15 11:01:20 31ZK6600_039
39
TECHNICAL & CONSUMER INFORMATION
Remote Control Linkage
RETURN SPRING
Flexible wire coremounting
Solid wire coremounting
WIRE
5 mmCIRCLIP
THROTTLELEVER
WIRE HOLDER
4 mm SCREW
OPTIONAL
WIRE HOLDER CHOKE LEVERREMOTE CHOKE LINKAGE
REMOTE THROTTLE LINKAGE
THROTTLE LEVERFRICTION NUT
The throttle and choke control levers are provided with holes foroptional cable attachment. The following illustrations showinstallation examples for a solid wire cable and for a flexible, braidedwire cable. If using a flexible, braided wire cable, add a return springas shown.
It is necessary to loosen the throttle lever friction nut when operatingthe throttle with a remotely-mounted control.
01/11/15 11:01:29 31ZK6600_040
40
TECHNICAL & CONSUMER INFORMATION
Carburetor Modification for High Altitude Operation
Fuel Regulator Information
The GX270 and GX390 LPG-fueled engine do not require anymodifications for high-altitude operation. However, performance willdecrease at high altitudes.
This engine is certified to comply with U.S. EPA and California ARBemission regulations using the Impco Beam regulator specified in theinstallation instructions (see below).Honda used this regulator and other specific parts and adjustments todemonstrate compliance with the emission regulations. Adjustablefuel system parts must have U.S. EPA and California ARB approvedtamper resistant features to limit the available adjustment after thefuel system is correctly installed.If an equipment manufacturer did not install your engine in a product,you will need the installation instructions for the Honda certifiedsystem (see below).If you choose not to use the Honda fuel system, you must use asystem that has been certified by the fuel system manufacturer to beused on this Honda engine.Or, if you use a fuel system that is not already certified, you must havecertification test data satisfactory to the U.S. EPA or California ARB.The test data must prove the system will meet the emission standardboth when the engine is new and at the end of its emission durabilityperiod (hours).
To obtain a copy of the installation instructions for this engine, contactan independent Honda engine distributor, or our Customer ServiceDepartment (page ).47
02/07/24 11:39:55 31ZK6600_041
41
TECHNICAL & CONSUMER INFORMATION
Emission Control System Information
Source of Emissions
The U.S. and California Clean Air Acts
Tampering and Altering
The combustion process produces carbon monoxide, oxides ofnitrogen, and hydrocarbons. Control of hydrocarbons and oxides ofnitrogen is very important because, under certain conditions, theyreact to form photochemical smog when subjected to sunlight. Carbonmonoxide does not react in the same way, but it is toxic.
Honda utilizes lean carburetor settings and other systems to reducethe emissions of carbon monoxide, oxides of nitrogen andhydrocarbons.
EPA and California regulations require all manufacturers to furnishwritten instructions describing the operation and maintenance ofemission control systems.
The following instructions and procedures must be followed in orderto keep the emissions from your Honda engine within the emissionstandards.
Tampering with or altering the emission control system may increaseemissions beyond the legal limit. Among those acts that constitutetampering are:
Removal or alteration of any part of the intake, fuel or exhaustsystems.
Altering or defeating the governor linkage or speed-adjustingmechanism to cause the engine to operate outside its designparameters.
01/11/15 11:01:44 31ZK6600_042
42
TECHNICAL & CONSUMER INFORMATION
Problems That May Affect Emissions
Maintenance
Replacement Parts
If you are aware of any of the following symptoms, have your engineinspected 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.
Follow the maintenance schedule on page . Remember that thisschedule is based on the assumption that your machine will be usedfor its designed purpose. Sustained high-load or high-temperatureoperation, or use in unusually wet or dusty conditions, will requiremore frequent service.
A manufacturer of an aftermarket part assumes the responsibility thatthe part will not adversely affect emission performance. Themanufacturer or rebuilder of the part must certify that use of the partwill not result in a failure of the engine to comply with emissionregulations.
The emission control systems on your Honda engine were designed,built, and certified to conform with EPA and California emissionregulations. We recommend the use of genuine Honda partswhenever you have maintenance done. These original-designreplacement parts are manufactured to the same standards as theoriginal parts, so you can be confident of their performance. The useof replacement parts that are not of the original design and qualitymay impair the effectiveness of your emission control system.
22
01/11/15 11:01:55 31ZK6600_043
-
-
-
43
TECHNICAL & CONSUMER INFORMATION
Air Index
An Air Index Information hang tag/label is applied to engines certifiedto an emission durability time period in accordance with therequirements of the California Air Resources Board.
The bar graph is intended to provide you, our customer, the ability tocompare the emissions performance of available engines. The lowerthe Air Index, the less pollution.
The durability description is intended to provide you with informationrelating to the engine’s emission durability period. The descriptiveterm indicates the useful-life period for the engine’s emission controlsystem. See your Emission Control Warranty for additionalinformation.
Extended
Intermediate
Moderate
Descriptive Term
300 hours (0 65 cc)500 hours (greater than 65 cc)
125 hours (0 65 cc)250 hours (greater than 65 cc)
50 hours (0 65 cc)125 hours (greater than 65 cc)
Applicable to Emissions Durability Period
The Air Index Information hang tag must remain on the engine until itis sold. Remove the hang tag before operating the engine.
01/11/15 11:02:09 31ZK6600_044
× ×
× ×× ×
× ×
×
× ×
×
× ×× ×
× ×
±±
--
44
TECHNICAL & CONSUMER INFORMATION
Specifications
GX270
GX390
GX270/GX390 Tuneup
ITEM SPECIFICATION MAINTENANCE
50.7 lbs (23.0 kg)4-stroke, overhead valve, single cylinder
16.5 cu-in (270 cm )3.0 2.3 in (77 58 mm)
15.7 16.9 16.0 in(400 430 407 mm)
8.9 bhp (6.6 kW, 9.0 PS) at 3,600 rpm
Length Width Height
Dry weightEngine typeDisplacement[Bore Stroke]Max. outputMax. torqueFuel consumptionCooling systemIgnition systemPTO shaft rotation
14.1 lbf·ft (19.1 N·m, 1.95 kgf·m) at 2,500 rpm0.42 lb/hph (258 g/kWh, 190 g/PSh)
Forced airTransistorized magneto
Counterclockwise
Length Width Height
Dry weightEngine typeDisplacement[Bore Stroke]Max. outputMax. torqueFuel consumptionCooling systemIgnition systemPTO shaft rotation
16.7 17.7 17.4 in(425 450 443 mm)
63.9 lbs (29.0 kg)4-stroke, overhead valve, single cylinder
23.7 cu-in (389 cm )3.5 2.5 in (88 64 mm)
12.9 bhp (9.6 kW, 13.0 PS) at 3,600 rpm19.5 lbf·ft (26.5 N·m, 2.7 kgf·m) at 2,500 rpm
0.42 lb/hph (258 g/kWh, 190 g/PSh)Forced air
Transistorized magnetoCounterclockwise
Refer to page: 30
See your authorizedHonda dealer
Spark plug gap
Valve clearance
Other specifications
0.15 0.02 mm0.20 0.02 mm
0.028 0.031 in(0.70 0.80 mm)
]
][
[
No other adjustments needed.
(cold)(cold)
IN:EX:
01/11/15 11:02:24 31ZK6600_045
45
TECHNICAL & CONSUMER INFORMATION
Wiring Diagram
Engine Types With Oil Alert
01/11/15 11:02:30 31ZK6600_046
46
TECHNICAL & CONSUMER INFORMATION
CONSUMER INFORMATION
Honda Publications
Shop Manual
Parts Catalog
These publications will give you additional information formaintaining and repairing your engine. You may order them fromyour Honda engine dealer.
This manual covers complete maintenance and overhaul procedures.It is intended to be used by a skilled technician.
This manual provides complete, illustrated parts lists.
01/11/15 11:02:37 31ZK6600_047
47
TECHNICAL & CONSUMER INFORMATION
Warranty Service Information
Servicing dealership personnel are trained professionals. They shouldbe able to answer any question you may have. If you encounter aproblem that your dealer does not solve to your satisfaction, pleasediscuss it with the dealership’s management. The Service Manager orGeneral Manager can help. Almost all problems are solved in this way.
If you are dissatisfied with the decision made by the dealership’smanagement, contact the Honda Power Equipment CustomerRelations Office. You can write to:
Or telephone: (770) 497-6400
When you write or call, please give us this information:
Name and address of dealer who services your engine
Name of dealer who sold the engine to you
Model and serial number (see page )
Date of purchase
Your name, address and telephone number
A detailed description of the problem
American Honda Motor Co., Inc.Power Equipment DivisionCustomer Relations Office4900 Marconi DriveAlpharetta, Georgia 30005-8847
38
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48
MEMO
01/11/15 11:02:50 31ZK6600_049
- -
+-
QUICK REFERENCE INFORMATION
LPG with a propane content of95 % or higher
Fuel
Engine Oil
Spark Plug
CarburetorMaintenance
SAE 30, API SJ, for general use
1.16 US qt (1.10 )BPR6ES
W20EPR-U0.028 0.031 in (0.70 0.80 mm)
Check engine oil level.Check air filter.Change engine oil.
Refer to the maintenanceschedule on page 22.
Type
Type
CapacityType
Gap
Idle speedBeforeeach useFirst 20hoursSubsequent
NGK:DENSO:
,
(page 23)
(page 30)1,400 rpm (page 31)
(page 26)
200150
02/07/24 11:40:03 31ZK6600_050
31ZK660100X31-ZK6-6010 2003 Honda Motor Co., Ltd. -All Rights Reserved
K1:GX390300.2003.10
Printed in Japan
Owner’s ManualGX270・GX390
LPG-Fueled Engine
Black DIC 157
A H H C英 NEM3
GX270 AH O/M 31ZK6601GX270 AH O/M 31ZK6601