Unique GX690 User Manual [en, es, fr]

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., L
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 instr

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 shoul
by your dealer.

uctions.

d have been given to you

td.

SAFETY MESSAGES

OWNER’S MANUAL

MANUEL DE L’UTILISATEUR

MANUAL DEL PROPIETARIO

GX630 · GX660 · GX690

The engine exhaust from this product

contains chemicals known to the State of

California to cause cancer, birth defects

or other reproductive harm.

ENGLISHFRANÇAISESPAÑOL

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

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

These signal words mean:

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

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

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

Each message tells you what the hazard is, what can happen, and
what you can do to avoid or reduce injury.

DAMAGE PREVENTION MESSAGES

You will also see other important messages that are preceded by
the word NOTICE.

This word means:

Your engine or other property can b
don’t follow instructions.

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

2009 Honda Motor Co., Ltd. All Rights Reserved

37Z6L601
00X37-Z6L-6010

−

e damaged if you

GX630R · GX660R · GX690R

CONTENTS

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

COMPONENT & CONTROL

................................LOCATION .3

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

BEFORE OPERATION

.................................... 4.SKCEHC

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

SAFE OPERATING

THE IMPORTANCE OF

MAINTENANCE

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

...........................REFUELING .7

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

.........................Oil Change .8

.............................OIL FILTER .9

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

..........................Inspection .9

............................Cleaning .9

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 .6

....................MAINTENANCE .6

......MAINTENANCE SAFETY .6

.......SAFETY PRECAUTIONS .7

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

..................Oil Level Check .8

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

.............SPARK ARRESTER .11

HELPFUL TIPS &

......................SUGGESTIONS .11

NSPORTING .12

TAKING CARE OF

Battery Connections for

Carburetor Modifications for

Emission Control System

..............................Air Index .17

Quick Reference

WARRANTY AND
DISTRIBUTOR/DEALER

CUSTOMER SERVICE

................TRA

....................Electric Starter .14

.........................Information .16

.....................Specifications .17

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

................Wiring Diagrams .18

...................INFORMATION .19

...STORING YOUR ENGINE .11

....UNEXPECTED PROBLEMS .13

........FUSE REPLACEMENT .13

..TECHNICAL INFORMATION .14

.....Serial Number Location .14

.....Remote Control Linkage .15

.....High Altitude Operation .15

........Tuneup Specifications .17

.CONSUMER INFORMATION .19

.LOCATOR INFORMATION .19

1

SAFETY INFORMATION SAFETY LABEL LOCATION

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.

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
servicing dealer for replacement.

WARNING LABEL

WARNING LABEL For EU Except EU

attached to
product

supplied
with product

supplied
with product

attached to
product

Honda factory equipped muffler.

MUFFLER CAUTION LABEL

Gasoline is highly flammable and explosive.
Stop the engine and let cool before refueling.

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

supplied
with product

supplied
with product

not included

supplied with product

supplied with product

Read Owner’s Manual before operation.

Hot muffler can burn you.
Stay away if engine has been running.

2

ENGLISH

COMPONENT & CONTROL LOCATION

OIL LEVEL DIPSTICK

HIGH-MOUNT MUFFLER (B type)

FUEL FILTER

SPARK PLUG

OIL FILTER

OIL DRAIN BOLT

PROTECTOR
FAN COVER
PTO TYPE

SCREEN GRID

AIR CLEANER

PROTECTOR FAN
COVER TYPE

THROTTLE
LEVER

CHOKE
KNOB

ENGINE
SWITCH

OIL ALERT
INDICATOR

OIL FILLER CAP

SPARK PLUG

OIL DRAIN BOLT

ELECTRIC STARTER

HIGH-MOUNT MUFFLER
(A type)

SIDE-MOUNT MUFFLER

OIL FILTER

SCREEN GRID
PTO TYPE

HOUR METER

FEATURES

Oil Alert

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

The Oil Alert system is designed to prevent engine damage
caused by an insufficient amount of oil in the crankcase. Before
the oil level in the crankcase can fall below a safe limit, the Oil
Alert indicator (red) comes on and 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.

Hour Meter

After starting the engine, the
elapsed time of the engine in
use will be count.
It will not count the elapsed
time of the engine operation by
just turning the engine switch
ON.

Fuel-cut Solenoid

System (applicable types)

8

OIL ALERT
INDICATOR
(RED)

HOUR METER

The engine is equipped with a fuel-cut solenoid that allows fuel to
flow to the carburetor main jet when the engine switch is in the ON
or START position and stops the flow of fuel to the main jet when
the engine switch is in the OFF position.

The engine must be connected to the battery to energize the fuel­cut solenoid, allowing the engine to run. If the battery is
disconnected, fuel flow to the carburetor will stop.

ENGLISH

3

OPERATIONBEFORE OPERATION CHECKS

IS YOUR ENGINE READY TO GO?

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

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

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

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

Always check the following items before you start the engine:

Check the General Condition of the Engine

1.

Look around and underneath the engine for signs of oil or
gasoline leaks.

Remove any excessive dirt or debris, especially around the

2.
muffler. 1.

3.

Look for signs of damage.

4.

Check that all shields and covers are in place, and all nuts, bolts,
and screws are tightened.

SAFE OPERATING PRECAUTIONS

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

SAFETY INFORMATION
OPERATION CHECKS

on page .

section on page and the

4

2

BEFORE

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

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

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

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

Do not operate the engine on slopes greater than 20°.

STARTING THE ENGINE

If the fuel tank is equipped with a valve, be sure the fuel valve is
in the OPEN or ON position before attempting to start the engine.

2.

To start a cold engine, pull the choke knob out to the CLOSED
position.

Check the Engine

1.

Check the fuel level. Starting with a full tank will help to
eliminate or reduce operating interruptions for refueling.

2.

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

8

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.

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

3.

9
element will restrict air flow to the carburetor, reducing engine
performance.

Check the equipment powered by this engine.

4.

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

CCLLOOSSEEDD

OOPPEENN

CHOKE KNOB

To restart a warm engine, leave the choke knob in the OPEN
position.

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

4

ENGLISH

3.

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

6.

Warm up the engine for 2 or 3 minutes.

7.

If the choke knob was pulled to the CLOSED position to start the
engine, gradually push it to the OPEN position as the engine
warms up.

MMIINN..

MMIINN..

THROTTLE LEVER

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

4.

Turn the engine switch to
the ON position.

OONN

ENGINE
SWITCH

5.

Operate the starter.

OONN

CCLLOOSSEEDD

CHOKE KNOB

OOPPEENN

STOPPING THE ENGINE

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.

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

If the engine fails to start within 5
seconds, release the engine switch,
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
engine switch, allowing it to return
to the ON position.

OONN

START

START

ENGINE
SWITCH

MMIINN..

THROTTLE LEVER

2.

Turn the engine switch to the OFF position.

OFF

OFF

ENGINE SWITCH

3.

If the fuel tank is equipped with a valve, turn the fuel valve to the

MMIINN..

CLOSED or OFF position.

ENGLISH

5

SETTING ENGINE SPEED

SERVICING YOUR ENGINE

Position the throttle lever for the desired engine speed.

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

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

MMAAXX..

MMAAXX..

MMIINN..

THROTTLE LEVER

MMIINN..

Do not disconnect the battery from the engine while the engine is
running. Disconnecting the battery causes the fuel-cut solenoid to
shut off the flow of fuel to the carburetor main jet, and the engine
will stop.

THE IMPORTANCE OF MAINTENANCE

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

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

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

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

The maintenance schedule applies to normal operating conditions.
If you operate your engine under severe conditions, such as
sustained high-load or high-temperature operation, or use in
unusually wet or dusty conditions, consult your Honda 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 SAFETY

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

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

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

6

ENGLISH

SAFETY PRECAUTIONS

REFUELING

Make sure the engine is off before you begin any maintenance
or repairs. To prevent accidental startup, disconnect the spark
plug cap. This will eliminate several potential hazards:

Carbon monoxide poisoning from engine exhaust.

−

Operate outside, away from open windows or doors.

Burns from hot parts.

−

Let the engine and exhaust system cool before touching.

Injury from moving parts.

−

Do not run the engine unless instructed to do so.

Read the instructions before you begin, and make sure you have
the tools and skills required.

T

o reduce the possibility of fire or explosion, be careful when
working around gasoline. Use only a non-flammable solvent,
not gasoline, to clean parts. Keep cigarettes, sparks and flames
away from all fuel related parts.

Remember that an authorized Honda servicing dealer knows your
engine best and is fully equipped to maintain and repair it.

To ensure the best quality and reliability, use only new Honda
Genuine parts or their equivalents for repair and replacement.

MAINTENANCE SCHEDULE

REGULAR SERVICE PERIOD (3)

Perform at every

indicated month or

operating hour interval,

whichever comes first.

ITEM

Engine oil

Engine oil filter

Air cleaner

Spark plug

Spark arrester

( )

applicable types

Idle speed

Valve clearance

Combustion

chamber

Fuel filter

Fuel tube

Replace the paper filter element only.

＊

Refer to the Shop Manual.

＊＊

(1)

Service more frequently when used in dusty areas.

(2)

These items should be serviced by your Honda servicing

Check level

Change

Replace

Check

Clean

Replace

Check-adjust

Replace

Clean

Check-adjust

Check-adjust

Clean

Replace

Check

Each

Month

Use

or

20 Hrs

Every 200 Hrs.

After every 1000 Hrs. (2)

Every2years (Replace if necessary) (2)

Months

or

100 Hrs

(1

(4)

Every

Year

or

300 Hrs

)

Every 6

First

(2)

(2)

(2)

Every 2

Years

or

500 Hrs

＊

Refer

to

Page

8

8

9

9

9

10

11

＊＊
＊＊
＊＊

＊＊
＊＊

dealer, unless you have the proper tools and are mechanically
proficient. Refer to the Honda shop manual fo

r service

procedures.

(3)

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

Recommended Fuel

Unleaded gasoline

U.S.
Except U.S.

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

This engine is certified to operate on unleaded gasoline with a
pump octane rating of 86 or higher (a research octane rating of 91
or higher).
Refuel in a well ventilated area with the engine stopped. If the
engine has been running, allow it to cool first. Never refuel the
engine insideabuilding wh

ere gasoline fumes may reach flames
or sparks.
You may use unleaded gasoline containing no more than 10%
ethanol (E10) or 5% methanol by volume. In addition, methanol
must contain cosolvents and corrosion inhibitors. Use of fuels
with content of ethanol or methanol greater than shown above
may cause starting and/or performance problems. It may also
damage metal, rubber, and plastic parts of the fuel system. Engine
damage or performance problems that result from using a fuel
with percentages of ethanol or methanol greater than shown
above are not covered under the Warranty.

I

f your equipment will be used on an infrequent or intermittent
basis, please refer to the fuel section of the STORING YOUR
ENGINE chapter (see page ) for additional information

11

regarding fuel deterioration.

Gasoline is highly flammable and explosive, and yo

u

can be burned or seriously injured when refueling.

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

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

Distributor’s Limited Warranty.

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

With the engine stopped and on a level surface, remove the fuel
filler cap and check the fuel level. Refill the tank if the fuel level is
low.
Refer to the instructions provided with the equipment powered by
this engine for refuelling.

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. It may be necessary to lower the fuel level depending
on operating conditions. Af

ter refueling, tighten the fuel tank cap

securely.

In Europe and other countries where the machinery directive

(4)

2006/42/EC is enforced, this cleaning should be done by your
servicing dealer.

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

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

Spilled fuel is not onlyafire hazard, it causes environmental
damage. Wipe up spills immediately.

ENGLISH

7

ENGINE OIL

Oil Change

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

Recommended Oil

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

Synthetic 5W-30

AMBIENT TEMPERATURE

SAE 10W-30 or 5W-30 is recommended for general use. Use a full
synthetic 5W-30 for starting/operating temperatures between 5°F

−−−

( 15°C) and 13°F ( 25°C). Other viscosities shown in the chart
may be used when the average temperature in your area is within
the indicated range.

Oil Level Check

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, drain bolt and sealing washer.

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

2.

bolt and new sealing washer, and tighten the drain bolt securely.

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

OIL FILLER CAP OIL LEVEL DIPSTICK

UPPER
LIMIT

LOWER
LIMIT

SEALING WASHER

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

Start the engine and let it idle for 1 or 2 minutes. Stop the engine

1.
and wait for 2 or 3 minutes.

Remove the oil level dipstick and wipe it clean.

2.

Fully insert the oil level dipstick, then remove it to check the oil

3.
level.

If the oil level is low, remove the oil filler cap, and fill with the

4.
recommended oil to the upper limit mark on the oil level dipstick.

Reinstall the oil level dipstick and oil filler cap.

5.

OIL FILLER
CAP

OIL LEVEL DIPSTICK

UPPER LIMIT

LOWER LIMIT

DRAIN BOLT

With the engine in a level position, fill with the recommended oil

3.
to the upper limit mark on the oil level dipstick.

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

Distributor’s

Limited Warranty.

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

Reinstall the oil filler cap and oil level dipstick securely.

4.

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

Distributor’s Limited

Warranty.

The Oil Alert system (applicable types) will automatically stop the
engine before the oil level falls below the safe limit. However, to
avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.
8

ENGLISH

OIL FILTER

AIR CLEANER

Change

Drain the engine oil, and retighten the drain bolt securely.

1.

Remove the oil filter, and drain the oil into a suitable container.

2.
Dispose the used oil and filter in a manner compatible with the
environment.

Use an oil filter socket, rather than a strap wrench, to avoid
striking and damaging the oil pressure switch.

SEAL

OIL FILTER

FILTER MOUNTING BASE OIL FILTER SOCKET

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

7

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

Distributor’s Limited

Warranty.

Inspection

Remove the air cleaner cover and inspect the filter elements.
Clean or replace dirty filter elements. Always replace damaged
filter elements.

Cleaning

1.

Pull the air cleaner cover latch to the unlocked position, and
remove the cover.

Remove the wing nut from the paper filter element.

2.

3.

Remove the paper filter element and foam filter element from
the air cleaner case.

3.

Clean the filter mounting base, and coat the seal of the new oil
filter with clean engine oil.

Use only a Honda Genuine oil filter or a filter of equivalent
quality specified for your model. Using the wrong filter, or a
non-Honda filter which is not of equivalent quality, may cause
engine damage.

4.

Screw on the new oil filter by hand until the seal contacts the
filter mounting base, then use an oil filter socket tool to tighten
the filter an additional 3/4 turn.

Oil filter tightening torque:

5.

Refill the crankcase with the specified amount of the
recommended oil (see page ). Reinstall the oil filler cap and oil

12 N·m (1.2 kgf·m , 9 lbf·ft)

8

level dipstick.

6.

Start the engine, and check for leaks.

7.

Stop the engine, and check the oil level as described on page .
If necessary, add oil to bring the oil level to the upper limit mark
on the oil level dipstick.

4.

FOAM FILTER
ELEMENT

AIR CHAMBER

PACKING

5.

8

Remove the foam filter element from the paper filter element.

AIR CLEANER COVER LATCH

AIR CLEANER
COVER

WING NUT

PAPER FILTER
ELEMENT

AIR CLEANER CASE

Inspect both filter elements, and replace them if they are
damaged. Always replace the paper filter element at the
scheduled interval (see page ).

7

ENGLISH

9

6.

Clean the filter elements if they are to be reused.

SPARK PLUG

Paper 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 air cleaner case side.

Never try to brush off dirt; brushing will force dirt into the fibers.
Replace the paper filter element if it is excessively dirty.

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

Recommended Spark Plug:

ZFR5F (NGK)

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

Incorrect spark plugs can cause engine damage.

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

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

1.

Disconnect the spark plug caps, and remove any dirt from
around the spark plug area.

Remove the spark plugs with a 5/8-inch spark plug wrench.

2.

Dry

Soak Squeeze SqueezeOil

7.

Wipe dirt from the inside of the air cleaner body and cover,
using a moist rag. Be careful to prevent dirt from entering the air
chamber that leads to the carburetor.

8.

Place the foam filter element over the paper filter element, and
reinstall the assembled filter element. Be sure the packing is in
place beneath the filter element. Tighten the wing nut securely.

Lock the air cleaner cover latch securely.

9.

SPARK PLUG CAP

SPARK PLUG WRENCH

3.

Inspect the spark plugs. Replace
them if damaged, badly fouled,

SIDE ELECTRODE

if the sealing washer is in poor
condition, or if the electrode is
worn.

4.

Measure the spark plug

0.7 0.8 mm

−

(0.028 0.031 in)

−

electrode gaps with a wire-type
feeler gauge. Correct the gap, if
necessary, by carefully bending
thesideelectrode.
The gap should be:

0.7 0.8 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 5/8-inch spark plug
wrench to compress the sealing washer.

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

10

When reinstalling the original spark plug, tighten 1/8 1/4 turn
after the spark plug seats to compress the washer.

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

Attach the spark plug caps to the spark plugs.

7.

ENGLISH

−

SPARK ARRESTER (applicable types)

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. The
spark arrester is optional part. 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 Cleaning & Inspection

Remove the spark arrester:

1.

HIGH-MOUNT MUFFLER TYPE: Remove the special screw from
the muffler and remove the spark arrester.

MUFFLER

SPECIAL
SCREW

SPARK ARRESTER

SIDE-MOUNT MUFFLER TYPE: Remove the6mm flange bolts
from the muffler protector and remove the muffler protector.
Remove the special screws from the spark arrester and remove
the spark arrester from the muffler.

MUFFLER

SPECIAL SCREWS (3)

HELPFUL TIPS & SUGGESTIONS

STORING YOUR ENGINE

Storage Preparation

Proper storage preparation is essential for keeping your engine
trouble-free and looking good. The following steps will help to
keep rust and corrosion from impairing your engine’s function and
appearance, and will make the engine easier to start when you use
it again.

Cleaning

If the

engine has been running, allow it to cool for at least half an
hour before cleaning. Clean all exterior surfaces, touch up any
damaged paint, and coat other areas that may rust with a light film
of oil.

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

Fuel

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

Gasoli

ne will oxidize and deteriorate in storage. Deteriorated
gasoline will cause hard starting, and it leaves gum deposits that
clog the fuel system. If the gasoline in your engine deteriorates
during storage, you may need to have the carburetor and other
fuel system components serviced or replaced.
The length of time that gasoline can be left in your fuel tank and
carburetor without causing functional problems will vary with
such factors as gasoline blend, your storage temperatures, and
whether the fuel tank is partially or completely filled. The air in a
partially filled fuel tank promotes fuel deterioration. Very warm
storage temperatures accelerate fuel deterioration. Fuel
deterioration problems may occur within a few months, or even
less if the gasoline was not fresh when you filled the fuel tank.

ons.

SPARK ARRESTER

6 mm FLANGE BOLTS (4)

Use a brush to remove carbon deposits from the spark arrester

2.

MUFFLER PROTECTOR

screen. Be careful to avoid damaging the screen.

The spark arrester must be free of breaks and holes. Replace the
spark arrester if it is damaged.

HIGH-MOUNT MUFFLER TYPE SIDE-MOUNT MUFFLER TYPE

SPARK ARRESTER SCREEN

3.

Install the spark arrester and muffler protector in the reverse
order of disassembly.

Fuel system damage or engine p

erformance 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 promote fuel
deterioration during storage. If you keep a container of gasoline
for refueling, be sure that it contains only fresh gasoline.

Add gasoline stabilizer following the manufacturer’s instructions.

1.

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

2.

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

Stop the engine, and if the fuel tank is equipped with a fuel valve,

3.

move the fuel valve to the CLOSED or OFF position.

ENGLISH

d the

11

Draining the Fuel Tank and Carburetor

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

Storage Precautions

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

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

Disconnect the fuel line to the engine, and drain the fuel tank

1.
into an approved gasoline container. If the fuel tank is equipped
with a valve, turn the fuel valve to the OPEN or ON position to
enable draining. After draining is completed, reconnect the fuel
line.

Loosen the carburetor drain screw, and drain the carburetor into

2.
an approved gasoline container. After draining is completed,
tighten the carburetor drain screw.

DRAIN SCREW

CARBURETOR

Engine Oil

Change the engine oil (see page ).

1.

Remove the spark plugs (see page ).

2.

Pour 5 10 cm

3.

−−−

(5 10 cc, 1 2 teaspoons) of clean engine oil

8

10

into each cylinder.

Turn the engine for a few seconds by turning the engine switch

4.
to the START position to distribute the oil in the cylinders.

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.

Unless all fuel has been drained from the fuel tank, leave the fuel
valve in the CLOSED or OFF position to reduce the possibility of
fuel 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 installed, remove the battery and store it in a cool, dry place.
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

4

If the fuel was drained during storage preparation, fill the tank with
fresh gasoline. If you keep a container of gasoline for refueling, be
sure it contains only fresh gasoline. Gasoline oxidizes and
deteriorates over time, causing hard starting.

If the cylinders were coated with oil during storage preparation,
the engine may smoke briefly at startup. This is normal.

TRANSPORTING

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

Keep the engine level when transporting to reduce the possibility
of fuel leakage. If the fuel tank is equipped with a fuel valve, move
the fuel valve lever to the CLOSED or OFF position.

Reinstall the spark plugs.

5.

12

ENGLISH

TAKING CARE OF UNEXPECTED PROBLEMS

FUSE REPLACEMENT

ENGINE WILL
NOT START

1.

starting:
Check battery
and fuse.
Check control

2.

positions.

Check engine

3.

oil level.

Check fuel.

4.

Remove and

5.

inspect spark
plugs.

Take engine to

6.

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

ENGINE LACKS
POWER

Check air filter.

1.

Check fuel.

2.

Take engine to

3.

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

Possible Cause Correction

Battery

Recharge battery.

discharged.

Fuse burnt out.
Fuel valve
CLOSED or OFF.
(If equipped)
Choke OPEN.

Replace fuse.
Move lever to
OPEN or ON
position.
Move knob to
CLOSED position
unless the engine

is warm (p. 4).
Engine switch
OFF.

Turn engine switch

to ON position

(p. 5).
Engine oil level
low (Oil Alert
stops engine).

Fill with the

recommended oil

to the proper level

(p. 8).
Out of fuel.
Stale fuel;
engine stored
without treating
or draining

Refuel (p. 7).

Drain fuel tank and

carburetor (p. 12).

Refuel with fresh

gasoline (p. 7).
gasoline, or
refueled with
stale gasoline.
Spark plugs
faulty, fouled, or

Gap, or replace

spark plugs (p. 10).
improperly
gapped.
Spark plugs wet
with fuel
(flooded engine).

Dry and reinstall

spark plugs (p. 10).

Start engine with

throttle lever in

MAX. position

(p. 6).
Fuel filter
restricted,
carburetor

Replace or repair

faulty components

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

Possible Cause Correction

Filter element(s)
restricted.

Clean or replace

filter element(s)

(p. 9).
Stale fuel;
engine stored
without treating
or draining

Drain fuel tank and

carburetor (p. 12).

Refuel with fresh

gasoline (p. 7).
gasoline, or
refueled with
stale gasoline.
Fuel filter
restricted,
carburetor

Replace or repair

faulty components

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

The electric starter relay circuit and battery charging circuit are
protected by a 30-ampere fuse. If the fuse burns out, the electric
starter will not operate.Electric

Disconnect the wire connector, and remove the wire harnesses

1.
from the wire harness band.

WIRE HARNESSES

WIRE HARNESS
BAND

WIRE CONNECTOR

Remove the 6 8 mm special screw from the rear cover of the

2.

×

engine switch box, and remove the rear cover.

Remove the fuse cover, and inspect the fuse.

3.

SWITCH BOX REAR COVER

×

6 8 mm SPECIAL SCREW

30 A FUSE

FUSE COVER

If the fuse is burnt out, remove the fuse cover, then pull out and
discard the burnt-out fuse. Install a new 30-ampere fuse, and
reinstall the fuse cover.

Never use a fuse with a rating greater than 30 amperes. Serious
damage to the electrical system or a fire could result.

Reinstall the rear cover. Install the 6 8 mm special screw and

4.

×

tighten it securely.

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 Honda servicing dealer for repair.

ENGLISH

13

TECHNICAL INFORMATION

Battery Connections for Electric Starter

Serial Number Location

Record the engine serial number, type and purchase date in the
spaces below. You will need this information when ordering parts
and when making technical or warranty inquiries.

SERIAL NUMBER &
ENGINE TYPE LOCATION

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

−

Engine type: ___ ___ ___ ___

Date Purchased: ______ / ______ / ______

Recommended Battery

GX630
GX660

12 V 36 Ah

−

GX690

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.

＋

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

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

WARNING:

contain lead and lead compounds.

1.

Connect the battery positive ( ) cable to the starter solenoid

Battery posts, terminals, and related accessories

Wash hands after handling.

＋

terminal as shown.

2.

Connect the battery negative ( ) cable to an engine mounting

−

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

3.

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

＋＋

terminal as shown.

4.

Connect the battery negative ( ) cable to the battery negative

−

( ) terminal as shown.

5.

Coat the terminals and cable ends with grease.

STARTER
SOLENOID

POSITIVE ( )
BATTERY CABLE

＋

−

NEGATIVE ( )
BATTERY CABLE

−

14

ENGLISH

Remote Control Linkage

The throttle and choke control levers are provided with holes for
optional cable attachment. The following illustrations show
installation examples for a solid wire cable and for a flexible,
braided wire cable.

WIRE HOLDER

For Throttle Cable

5mm
CIRCLIP

THROTTLE CONTROL LEVER

×

46mm

RIGHT SIDE CONTROL

THROTTLE CABLE

×

46mm

LEFT SIDE CONTROL

CABLE

CABLE

CHOKE CONTROL
LEVER

WIRE HOLDER

THROTTLE CONTROL LEVER

GOVERNOR SPRING

×

516mm(2)

CABLE HOLDER (2)

516mm(2)

CABLE
HOLDER (2)

CHOKE CABLE

×

46mm

×

THROTTLE CABLE

For Choke Cable

5mm
CIRCLIP

CHOKE CABLE

CHOKE CONTROL LEVER

WIRE HOLDER
(for throttle cable)

×

46mm

WIRE HOLDER
(for choke cable)

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.

THROTTLE CABLE

CHOKE CABLE

CHOKE CONTROL
LEVER

THROTTLE CONTROL
LEVER

GOVERNOR SPRING

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.

ENGLISH

15

Emission Control System Information

Replacement Parts

The emission control systems on your Honda engine were

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.

designed, built, and certified to conform with EPA, California
(models certified for sale in California), and Canadian emission
regulations. We recommend the use of Honda Genuine parts
whenever you have maintenance done. These original-design
replacement parts are manufactured to the same standards as the
original parts, so you can be confident of their performance. The
use of replacement parts that are not of the original design and
quality may impair the effectiveness of your emission control

Honda utilizes appropriate air/fuel ratios and other emissions

system.
control systems to reduce the emissions of carbon monoxide,
oxides of nitrogen, and hydrocarbons.
Additionally, Honda fuel systems utilize components and control
technologies to reduce evaporative emissions.

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

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

emission regulations.
EPA, California, and Canadian regulations require all
manufacturers to furnish written instructions describing the
operation and maintenance of emission control systems. 7

Maintenance

Follow the maintenance schedule on page . Remember that this

schedule is based on the assumption that your machine will be
The following instructions and procedures must be followed in
order to keep the emissions from your Honda engine within the
emission standards.

used for its designed purpose. Sustained high-load or high-

temperature operation, or use in unusually wet or dusty conditions,

will require more frequent service.

Tampering and Altering

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

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

Problems That May Affect Emissions

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

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

16

ENGLISH

Air Index

(Models certified for sale in California)

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

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

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

Warranty

for additional information.

Emission Control System

Descriptive Term Applicable to Emissions Durability Period

Moderate

50 hours (0 80 cc, inclusive)

−

125 hours (greater than 80 cc)

Intermediate

125 hours (0 80 cc, inclusive)

−

250 hours (greater than 80 cc)

Extended

300 hours (0 80 cc, inclusive)

−

500 hours (greater than 80 cc)

1,000 hours (225 cc and greater)

Specifications

GX630 (QAF-Type)

Length Width

××

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

×

Net power

(in accordance with SAE J1349 )

Max. Net torque

(in accordance with SAE J1349 )

Engine oil capacity

4-stroke, overhead valve, 2 cylinders (90° V-Twin)

15.5 kW (21.1 PS, 20.8 bhp) at 3,600 rpm

＊

＊

Without oil filter replacement:

405 410 438 mm

××

(15.9 16.1 17.2 in)

××

44.4 kg (97.9 lbs)

688.0 cm

××

[78.0 72.0 mm (3.07 2.83 in)]

(41.97 cu-in)

48.3 N·m (4.93 kgf·m, 35.6 lbf·ft)
at 2,500 rpm

1.5L(1.6USqt,1.3lmpqt)

With oil filter replacement:

1.7L(1.8USqt,1.5lmpqt)
Cooling system
Ignition system
PTO shaft rotation

CDI type magneto ignition

Forced air

Counterclockwise

GX660 (TAF-Type)

Length Width

××

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

×

Net power

(in accordance with SAE J1349 )

Max. Net torque

(in accordance with SAE J1349 )

Engine oil capacity

4-stroke, overhead valve, 2 cylinders (90° V-Twin)

16.0 kW (21.8 PS, 21.5 bhp) at 3,600 rpm

＊

＊

Without oil filter replacement:

429 450 438 mm

××

(16.9 17.7 17.2 in)

××

45.3 kg (99.9 lbs)

688.0 cm

××

[78.0 72.0 mm (3.07 2.83 in)]

(41.97 cu-in)

48.3 N·m (4.93 kgf·m, 35.6 lbf·ft) at
2,500 rpm

1.5L(1.6USqt,1.3lmpqt)

With oil filter replacement:

1.7L(1.8USqt,1.5lmpqt)
Cooling system
Ignition system
PTO shaft rotation

CDI type magneto ignition

Forced air

Counterclockwise

GX690 (TAF-Type)

Length Width

××

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

×

Net power

(in accordance with SAE J1349 )

Max. Net torque

(in accordance with SAE J1349 )

Engine oil capacity

4-stroke, overhead valve, 2 cylinders (90° V-Twin)

[78.0 72.0 mm (3.07 2.83 in)]

16.5 kW (22.4 PS, 22.1 bhp) at 3,600 rpm

＊

48.3 N·m (4.93 kgf·m, 35.6 lbf·ft) at

＊

Without oil filter replacement:

××

429 450 438 mm

××

(16.917.717.2in)

45.3 kg (99.9 lbs)

688.0 cm

(41.97 cu-in)

××

2,500 rpm

1.5L(1.6USqt,1.3lmpqt)

With oil filter replacement:

1.7L(1.8USqt,1.5lmpqt)
Cooling system
Ignition system

CDI type magneto ignition

PTO shaft rotation

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

＊

Forced air

Counterclockwise

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

Tuneup Specifications

Idle speed

GX630/660/690

SPECIFICATION

0.7 0.8 mm

−

(0.028 0.031 in)

−

1,400 150 rpm

±

MAINTENANCEITEM

Refer to page 10Spark plug gap

See your authorized

Honda dealer
Valve clearance
(cold)
Other specifications

IN: 0.08 0.02 mm
EX: 0.10 0.02 mm

±

±

See your authorized

Honda dealer

No other adjustments needed.

Quick Reference Information

Fuel

Engine oil

Unleaded gasoline (Refer to page 7 ).

U. S.
Except
U. S.

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

SAE 10W-30, API SJ or later, for general use.

Refer to page 8.
Spark plug
Maintenance

ZFR5F (NGK)
Before each use:

Check engine oil level. Refer to page 8.

Check air filter. Refer to page 9.

First 20 hours:

Change engine oil. Refer to page 8.

Subsequent:

Refer to the maintenance schedule on page 7.

ENGLISH

17

Wiring Diagrams

2.7 A Charge Coil and With Control Box Type 17 A Charge Coil and With Control Box Type

BATEIG LO ST

OFF

ON

START

Black

Bl

Yellow

Y

Blue

Bu

Green

G

Red

R

White

W

MAIN FUSE

(A)

ENGINE SWITCH

(B)

OIL LEVEL SWITCH

(C)

FUEL CUT SOLENOID

(D)

STARTER MOTOR

(E)

BATTERY

(F)

CHARGE COIL

(G)

LEFT IGNITION COIL

(H)

LEFT SPARK PLUG

(I)

RIGHT IGNITION COIL

(J)

RIGHT SPARK PLUG

(K)

REGULATOR

(L)

Br

Lb
Lg

Gr

RECTIFIER
HOUR METER

(M)

CONTROL BOX

(N)

O

P

Brown
Orange
Light blue
Light green
Pink
Gray

2.7 A Charge Coil and Without Control Box Type 17 A Charge Coil and Without Control Box Type

18

ENGLISH