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INTRODUCTION

Thank you for purchasing a Honda engine! We want to help you to get 
the best results from your new engine and to operate it safely. This 
manual contains information on how to do that; please read it carefully 
before operating the engine. If a problem should arise, or if you have any 
questions about your engine, consult an authorized Honda servicing 
dealer.

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

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

Review the instructions provided with the equipment powered by this 
engine for any additional information regarding engine startup, 
shutdown, operation, adjustments or any special maintenance 
instructions.

United States, Puerto Rico, and U.S. Virgin Islands:
We suggest you read the warranty policy to fully understand its coverage 
and your responsibilities of ownership. The warranty policy is a separate 
document that should have been given to you by your dealer.

SAFETY MESSAGES

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

A safety message alerts you to potential hazards that could hurt you or 

others. Each safety message is preceded by a safety alert symbol 

 and 

one of three words, DANGER, WARNING, or CAUTION.

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 entire book is filled with important safety  information –please read 
it carefully.

2019 Honda Motor Co., Ltd. –All Rights Reserved

GXR120

37ZDJ601
00X37-ZDJ-6010

OWNER’S MANUAL

MANUEL DE L’UTILISATEUR

MANUAL DEL PROPIETARIO

GXR120

CONTENTS

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.

This word means:

Your engine, other property, or the environment can be 
damaged if you do not follow instructions.

©

The engine exhaust from this product 

contains chemicals known to the State of 

California to cause cancer, birth defects, 

or other reproductive harm.

INTRODUCTION....................................1
SAFETY MESSAGES..............................1
SAFETY INFORMATION......................2
SAFETY LABEL LOCATION ................2
COMPONENT & CONTROL
LOCATIONS............................................3
FEATURES...............................................3
BEFORE OPERATION CHECKS..........4
OPERATION............................................4

SAFE OPERATING 
PRECAUTIONS ..................................4
STARTING THE ENGINE .................4
SETTING ENGINE SPEED................5
STOPPING THE ENGINE.................6

SERVICING YOUR ENGINE .................6

THE IMPORTANCE OF 
MAINTENANCE ................................6
MAINTENANCE SAFETY ................6
SAFETY PRECAUTIONS ..................6
MAINTENANCE SCHEDULE..........7
REFUELING ........................................7
ENGINE OIL........................................8

Recommended Oil.....................8
Oil Level Check............................8
Oil Change ....................................8

AIR CLEANER.....................................9

Inspection..................................... 9
Cleaning ........................................ 9

SPARK PLUG ...................................10
SPARK ARRESTER ..........................10

HELPFUL TIPS & SUGGESTIONS ...11

STORING YOUR ENGINE .............11
TRANSPORTING.............................12

TAKING CARE OF UNEXPECTED 
PROBLEMS ...........................................12
TECHNICAL INFORMATION ...........13

Serial Number Location .............13
Carburetor Modifications for 
High Altitude Operation ............13
Emission Control System 
Information.....................................13
Air Index...........................................14
Specifications.................................15
Tuneup Specifications ................15
Quick Reference Information...15
Wiring Diagrams...........................15

CONSUMER INFORMATION...........16

Distributor/Dealer Locator 
Information.....................................16
Customer Service 
Information.....................................16

37ZDJ6010.fm  1 ページ  2019年11月18日 月曜日 午後3時57分

Summary of Contents for GXR120UT

Page 1: ...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 entire book is filled with important safety information please read it carefully 2019 Honda Motor Co Ltd All Rights Reserved GXR120 37ZDJ601 00X37 ZDJ 6010 OWNER S MANUAL MANUEL DE L UTILISATEUR MANUAL DEL PROPIETARIO GXR120 CONTEN...

Page 2: ...t is running 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 servicing dealer for replacement WARNING LABEL For EU Except EU attached to product supplied with product supplied with product attached to product supplied with product supplied with product MUFFLER CAUTION LABEL F...

Page 3: ...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 8 before troubleshooting in other areas FUEL FILLER CAP FUEL TANK SPARK PLUG MUFFLER inside the cover AIR CLEANER OIL FILLER CAP DIPSTICK RECOIL STARTER STARTER GRIP ENGINE CONTROLS FUEL VAL...

Page 4: ...trict air flow to the carburetor reducing engine performance 5 4 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 OPERATION SAFE OPERATING PRECAUTIONS Before operating the engine for the first time please review the SAFETY INFORMATION section on page...

Page 5: ...D position to start the engine gradually move it to the OPEN position as the engine warms up SETTING ENGINE SPEED Position the throttle lever for the desired engine speed Some engine applications use a remote mounted throttle control rather than the engine mounted throttle lever shown here For engine speed recommendations refer to the instructions provided with the equipment powered by this engine...

Page 6: ...you of every conceivable hazard that can arise in performing maintenance Only you can decide whether or not you should perform a given task SAFETY PRECAUTIONS Make sure the engine is off before you begin any maintenance or repairs To prevent unintentional startup disconnect the spark plug cap This will eliminate several potential hazards Carbon monoxide poisoning from engine exhaust Operate outsid...

Page 7: ...l information regarding fuel deterioration Never use stale or contaminated gasoline or an oil gasoline mixture Avoid getting dirt or water in the fuel tank 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 gasoline that is stale contaminated or mixe...

Page 8: ...amage This type of damage is not covered by the Distributor s Limited Warranty The Oil Alert system applicable types will automatically stop the engine before the oil level falls below the safe limit However to avoid the inconvenience of an unexpected shutdown always check the engine oil level before startup Oil Change Drain the used oil when the engine is warm Warm oil drains quickly and complete...

Page 9: ...filter element at the scheduled interval see page 7 5 Clean the air filter elements if they are to be reused Paper air filter element Tap the paper air filter element several times on a hard surface to remove dirt or blow compressed air not exceeding 207 kPa 2 1 kgf cm2 30 psi through the filter element from the air cleaner case side Never try to brush off dirt brushing will force dirt into the fi...

Page 10: ...rtightening the spark plug can damage the threads in the cylinder head 9 Attach the spark plug cap to the spark plug SPARK ARRESTER optional equipment In Europe and other countries where the machinery directive 2006 42 EC is enforced this cleaning should be done by your servicing dealer Your engine is not factory equipped with a spark arrester In some areas it is illegal to operate an engine witho...

Page 11: ...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...

Page 12: ...nning allow it to cool for at least 15 minutes before loading the engine powered equipment on the transport vehicle A hot engine and exhaust system can burn you and can ignite some materials Keep the engine level when transporting to reduce the possibility of fuel leakage Turn the fuel valve to the OFF position see page 6 TAKING CARE OF UNEXPECTED PROBLEMS ENGINE WILL NOT START ENGINE LACKS POWER ...

Page 13: ...ty Your new Honda complies with both the U S EPA and State of California emission regulations American Honda provides the same emission warranty coverage for Honda Power Equipment engines sold in all 50 states In all areas of the United States your Honda Power Equipment engine is designed built and equipped to meet the U S EPA and California Air Resources Board emission standard for spark ignited ...

Page 14: ...f non Honda replacement parts or service performed at a location other than an authorized Honda dealership you may use comparable EPA certified parts and have service performed at non Honda locations However the use of replacement parts that are not of the original design and quality may impair the effectiveness of your emissions control system A manufacturer of an aftermarket part assumes the res...

Page 15: ...il capacity 0 40 L 13 US oz 0 35 lmp qt Fuel tank capacity 0 77 L 0 203 US gal 0 169 lmp gal Cooling system Forced air Ignition system Transistor type magneto ignition PTO shaft rotation Counterclockwise ITEM SPECIFICATION MAINTENANCE Spark plug gap 0 6 0 7 mm 0 024 0 028 in Refer to page 10 Idle speed 1 550 150 min 1 rpm Refer to shop manual Valve clearance cold IN 0 15 0 04 mm EX 0 20 0 04 mm Se...

Page 16: ... with the decision made by the dealership s management contact the Honda Office as shown Honda s Office When you write or call please provide this information Equipment manufacturer s name and model number that the engine is mounted on Engine model serial number and type see page 13 Name of dealer who sold the engine to you Name address and contact person of the dealer who services your engine Dat...

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