Honda Automobiles GX670, GX620 User Manual
INTRODUCTION
Thank you for purchasing a Honda engine. We want to help you to
get the best results from your new engine and to operate it safely.
This manual contains information on how to do that; please read it
carefully before operating the engine. If a problem should arise, or
if you have any questions about your engine, consult an
authorized Honda servicing dealer.
All information in this publication is based on the latest product
information available at the time of printing. Honda Motor Co., Ltd.
reserves the right to make changes at any time without notice and
without incurring any obligation. No part of this publication may
be reproduced without written permission.
This manual should be considered a permanent part of the engine
and should remain with the engine if resold.
Review the instructions provided with the equipment powered by
this engine for any additional information regarding engine
startup, shutdown, operation, adjustments or any special
maintenance instructions.
United States, Puerto Rico, and U.S. Virgin Islands:
We suggest you read the warranty policy to fully understand its
coverage and your responsibilities of ownership. The warranty
policy is a separate document that should have been given to you
by your dealer.
SAFETY MESSAGES
OWNER’S MANUAL
MANUEL DE L’UTILISATEUR
MANUAL DEL PROPIETARIO
GX610 · GX620 · GX670
The engine exhaust from this product
contains chemicals known to the State of
California to cause cancer, birth defects
or other reproductive harm.
ENGLISHFRANÇAISESPAÑOL
Your safety and the safety of others are very important. We have
provided important safety messages in this manual and on the
engine. Please read these messages carefully.
A safety message alerts you to potential hazards that could hurt
you or others. Each safety message is preceded by a safety alert
symbol and one of three words, DANGER, WARNING, or
CAUTION.
These signal words mean:
You WILL be KILLED or SERIOUSLY
HURT if you don’t follow instructions.
You CAN be KILLED or SERIOUSLY
HURT if you don’t follow instructions.
You CAN be HURT if you don’t follow
instructions.
Each message tells you what the hazard is, what can happen, and
what you can do to avoid or reduce injury.
DAMAGE PREVENTION MESSAGES
You will also see other important messages that are preceded by
the word NOTICE.
This word means:
Your engine or other property can be damaged if you
don’t follow instructions.
The purpose of these messages is to help prevent damage to your
engine, other property, or the environment.
2007 Honda Motor Co., Ltd. All Rights Reserved
37Z6C601
00X37-Z6C-6010
−
GX610U1·GX620U1·GX670U
CONTENTS
.......................INTRODUCTION .1
COMPONENT & CONTROL
................................LOCATION .2
................................FEATURES .3
BEFORE OPERATION
....................................CHECKS .3
..............................OPERATION .4
SAFE OPERATING
THE IMPORTANCE OF
MAINTENANCE
............................SCHEDULE .6
...........................REFUELING .7
...........................ENGINE OIL .7
.........................Oil Change .8
.............................OIL FILTER .8
........................AIR CLEANER .9
..........................Inspection .9
............................Cleaning .9
.......................FUEL FILTER .10
ENGLISH
................SAFETY MESSAGES .1
..........SAFETY INFORMATION .2
.....SAFETY LABEL LOCATION .2
.....................PRECAUTIONS .4
......STARTING THE ENGINE .4
......STOPPING THE ENGINE .5
.....SETTING ENGINE SPEED .5
.....SERVICING YOUR ENGINE .6
....................MAINTENANCE .6
......MAINTENANCE SAFETY .6
.......SAFETY PRECAUTIONS .6
............Recommended Oil .7
..................Oil Level Check .7
......................SPARK PLUG .10
.............SPARK ARRESTER .11
HELPFUL TIPS &
......................SUGGESTIONS .11
...STORING YOUR ENGINE .11
................TRANSPORTING .12
TAKING CARE OF
....UNEXPECTED PROBLEMS .13
........FUSE REPLACEMENT .13
TECHNICAL & CONSUMER
.......................INFORMATION .14
.....Serial Number Location .14
Battery Connections for
....................Electric Starter .14
.....Remote Control Linkage .15
Carburetor Modifications for
.....High Altitude Operation .15
Emission Control System
.........................Information .16
..............................Air Index .17
.....................Specifications .17
........Tuneup Specifications .18
Quick Reference
.........................Information .18
................Wiring Diagrams .18
.CONSUMER INFORMATION .19
Distributor/Dealer Locator
.........................Information .19
Customer Service
.........................Information .19
1
COMPONENT & CONTROL LOCATIONSAFETY INFORMATION
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.
SAFETY LABEL LOCATION
This label warns you of potential hazards that can cause serious
injury. Read it carefully.
If the label comes off or becomes hard to read, contact your Honda
dealer for replacement.
For Canadian types only:
French label comes with
the engine.
SPARK PLUG
THROTTLE LEVER
OIL FILTER
OIL COOLER
(GX670 only)
FUEL FILTER
STARTER GRIP
SCREEN GRID
(optional parts)
FLYWHEEL
PTO TYPE
FLYWHEEL
PTO TYPE
AIR CLEANER
(Snorkel type)
AIR CLEANER
ENGINE SWITCH
CHOKE KNOB
Gasoline is highly flammable and explosive.
Turn engine off and let cool before refueling.
The engine emits toxic poisonous carbon
monoxide gas. Do not run in an enclosed area.
Read Owner’s Manual before operation.
PROTECTOR
TYPE (S.T.D)
RECOIL
STARTER
EQUIPPED
TYPE
2
ENGLISH
BEFORE OPERATION CHECKS
OIL FILLER CAP
SPARK
PLUG
OIL DRAIN BOLT
HIGH-MOUNT MUFFLER (B type)
ELECTRIC STARTER
OIL LEVEL
DIPSTICK
HIGH-MOUNT
MUFFLER (A type)
SIDE-MOUNT
MUFFLER
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.
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 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.
Fuel-cut Solenoid
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 main jet will stop.
Oil Cooler
System (applicable types)
7
(GX670)
2.
Remove any excessive dirt or debris, especially around the
muffler and recoil starter.
3.
Look for signs of damage.
4.
Check that all shields and covers are in place, and all nuts, bolts,
and screws are tightened.
Check the Engine
1.
Check the fuel level. 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
7
with a low oil level can cause engine damage.
The Oil Alert system (applicable types) will automatically stop
the engine before the oil level falls below safe limits. However,
to avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.
3.
Check the air filter element (see page ). A dirty air filter
9
element will restrict air flow to the carburetor, reducing engine
performance.
4.
Check the equipment powered by this engine.
The GX670 engine is equipped with an oil cooler to maintain the
correct temperature.
Review the instructions provided with the equipment powered
by this engine for any precautions and procedures that should
be followed before engine startup.
ENGLISH
3
OPERATION
SAFE OPERATING PRECAUTIONS
Turn the engine switch to
4.
the ON position.
Before operating the engine for the first time, please review the
SAFETY INFORMATION
OPERATION CHECKS
section on page and the
on page .
3
2
BEFORE
Carbon monoxide gas is toxic. Breathing it can cause
unconsciousness and even kill you.
Avoid any areas or actions that expose you to carbon
monoxide.
Review the instructions provided with the equipment powered by
this engine for any safety precautions that should be observed
with engine startup, shutdown or operation.
STARTING THE ENGINE
If the fuel tank is equipped with a valve, be sure the fuel valve is
1.
in the OPEN or ON position before attempting to start the engine.
To start a cold engine, pull the choke knob out to the CLOSED
2.
position.
CHOKE KNOB
OOPPEENN
CCLLOOSSEEDD
ON
Operate the starter.
5.
ELECTRIC STARTER:
Turn the key to the START position,
and hold it there until the engine starts.
If the engine fails to start within 5
seconds, release the key, and wait at
least 10 seconds before operating the
starter again.
Using the electric starter for more than
5 seconds at a time will overheat the
starter motor and can damage it.
When the engine starts, release the
key, allowing it to return to the ON
position.
OONN
ON
ENGINE
SWITCH
START
START
ENGINE
SWITCH
To restart a warm engine, leave the choke lever in the OPEN
position.
Some engine applications use a remote-mounted choke control
rather than the engine-mounted choke lever shown here. Refer
to the instructions provided by the equipment manufacturer.
Move the throttle lever away from the MIN. position, about 1/3
3.
of the way toward the MAX. position.
MMIINN..
MMIINN..
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.
RECOIL STARTER (applicable types):
Pull the starter grip lightly until you feel resistance, then pull
briskly in the direction of the arrow as shown below. Return the
starter grip gently.
STARTER GRIP
DDiirreeccttiioonn ttoo ppuullll
Do not allow the starter grip to snap back against the engine.
Return it gently to prevent damage to the starter.
If the choke knob has been pulled to the CLOSED position to
6.
start the engine, gradually push it to the OPEN position as the
engine warms up.
CHOKE KNOB
OPEN
CLOSED
4
ENGLISH
STOPPING THE ENGINE SETTING ENGINE SPEED
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.
MMIINN..
MMIINN..
2.
Turn the engine switch to the OFF position.
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..
MMIINN..
OFF
3.
If the fuel tank is equipped with a valve, turn the fuel valve to the
ENGINE SWITCH
OOFFFF
CLOSED or OFF position.
ENGLISH
5
SERVICING YOUR ENGINE
SAFETY PRECAUTIONS
THE IMPORTANCE OF MAINTENANCE
Good maintenance is essential for safe, economical and troublefree operation. It will also help reduce pollution.
Improper maintenance, or failure to correct a
problem before operation, can cause a malfunction in
which you can be seriously hurt or killed.
Always follow the inspection and maintenance
recommendations and schedules in this owner’s
manual.
To help you properly care for your engine, the following pages
include a maintenance schedule, routine inspection procedures,
and simple maintenance procedures using basic hand tools. Other
service tasks that are more difficult, or require special tools, are
best handled by professionals and are normally performed by a
Honda technician or other qualified mechanic.
The maintenance schedule applies to normal operating conditions.
If you operate your engine under severe conditions, such as
sustained high-load or high-temperature operation, or use in
unusually wet or dusty conditions, consult your servicing dealer
for recommendations applicable to your individual needs and use.
Maintenance, replacement, or repair of the emission control
devices and systems may be performed by any engine repair
establishment or individual, using parts that are ‘‘certified’’ to
EPA standards.
MAINTENANCE 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.
Make sure the engine is off before you begin any maintenance
or repairs. This will eliminate several potential hazards:
−
Carbon monoxide poisoning from engine exhaust.
Be sure there is adequate ventilation whenever you operate
the engine.
−
Burns from hot parts.
Let the engine and exhaust system cool before touching.
−
Injury from moving parts.
Do not run the engine unless instructed to do so.
Read the instructions before you begin, and make sure you have
the tools and skills required.
To reduce the possibility of fire or explosion, be careful when
working around gasoline. Use only a nonflammable solvent, not
gasoline, to clean parts. Keep cigarettes, sparks and flames
away from all fuel related parts.
Remember that an authorized Honda servicing dealer knows your
engine best and is fully equipped to maintain and repair it.
To ensure the best quality and reliability, use only new genuine
Honda parts or their equivalents for repair and replacement.
MAINTENANCE SCHEDULE
Each
First
REGULAR SERVICE PERIOD (3) Every 6
Perform at every
indicated month or
operating hour interval,
whichever comes first.
ITEM
Engine oil
Engine oil filter
Air filter
Spark plug
Spark arrester
()
applicable types
Idle speed
Valve clearance
Combustion
chamber
Fuel filter
Fuel tank
Fuel tube
Check level
Change
Replace
Check
Clean
Replace
Check-adjust
Replace
Clean
Check-adjust
Check-adjust
Clean
Check
Replace
Clean
Check
Use
Every 2 years (Replace if necessary) (2)
Every 3
Month
Months
Months
or
or
or
20 Hrs
50 Hrs
100 Hrs
(1)
After every 500 Hrs. (2)
Every year (2)
Every
Year
or
300 Hrs
Every
200 Hrs
＊
(2)
(2)
(2)
Refer
to
Page
7
8
8
9
9
10
11
＊＊
＊＊
＊＊
10
＊＊
＊＊
＊＊
Replace the paper air filter element only.
＊
Refer to the Shop Manual.
＊＊
Service more frequently when used in dusty areas.
(1)
These items should be serviced by your servicing dealer,
(2)
unless you have the proper tools and are mechanically
proficient. Refer to Honda shop manual for service procedures.
For commercial use, log hours of operation to determine
(3)
proper maintenance intervals.
Failure to follow this maintenance schedule could result in nonwarrantable failures.
6
ENGLISH
REFUELING
ENGINE OIL
Recommended Fuel
Unleaded gasoline
U.S.
Except U.S.
Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher
This engine is certified to operate on unleaded gasoline with a
pump octane rating of 86 or higher (a research octane rating of 91
or higher).
Refuel in a well-ventilated area with the engine stopped. If the
engine has been running, allow it to cool first. Never refuel the
engine inside a building where gasoline fumes may reach flames
or sparks.
You may use regular unleaded gasoline containing no more than
10% Ethanol (E10) or 5% Methanol by volume. In addition,
Methanol must contain cosolvents and corrosion inhibitors. Use of
fuels with content of Ethanol or Methanol greater than shown
above may cause starting and/or performance problems. It may
also damage metal, rubber, and plastic parts of the fuel system.
Engine damage or performance problems that result from using a
fuel with percentages of Ethanol or Methanol greater than shown
above are not covered under warranty.
Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when refueling.
Stop engine and keep heat, sparks, and flame away.
Refuel only outdoors.
Wipe up spills immediately.
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 classification SJ or later (or equivalent). Always check
the API service label on the oil container to be sure it includes the
letters SJ or later (or equivalent).
AMBIENT TEMPERATURE
SAE 10W-30 is recommended for general use. Other viscosities
shown in the chart may be used when the average temperature in
your area is within the indicated range.
Oil Level Check
Check the engine oil level with the engine stopped and in a level
position.
1.
GX670 ONLY: Start the engine and let it idle for 1 or 2 minutes.
Stop the engine and wait for 2 or 3 minutes.
2.
Remove the dipstick and wipe it clean.
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
With the engine stopped and on a level surface, remove the fuel
1.
Distributor’s Limited Warranty.
tank 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. After refueling, tighten the fuel tank cap
securely.
Keep gasoline away from appliance pilot lights, barbecues,
electric appliances, power tools, etc.
Spilled fuel is not only a fire hazard, it causes environmental
damage. Wipe up spills immediately.
3.
Fully insert the dipstick, then remove it to check the oil level.
4.
If the oil level is low, remove the oil filler cap, and fill to the
upper limit mark on the dipstick with the recommended oil.
5.
Reinstall the dipstick and filler cap.
FILLER CAP
UPPER LIMIT
DIPSTICK
LOWER LIMIT
Running the engine with a low oil level can cause engine damage.
This type of damage is not covered by the
Distributor’s Limited
Warranty.
The Oil Alert system (applicable types) will automatically stop the
engine before the oil level falls below the safe limit. However, to
avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.
ENGLISH
7
Oil Change
OIL FILTER
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 filler cap, drain bolt and washer.
Allow the used oil to drain completely, then reinstall the drain
2.
bolt and new 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.
SEALING
FILLER CAP
With the engine in a level position, fill to the upper limit mark on
3.
WASHER
DRAIN
BOLT
DIPSTICK
UPPER
LIMIT
LOWER
LIMIT
the dipstick with the recommended oil.
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 filler cap and dipstick securely.4.
Change
1.
Drain the engine oil, and retighten the drain bolt securely.
2.
Remove the oil filter, and drain the oil into a suitable container.
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 SOCKET
3.
Clean the filter mounting base, and coat the seal of the new oil
filter with clean engine oil.
Use only a genuine Honda 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 7/8 turn.
Oil filter tightening torque: 22 N·m (2.2 kgf·m , 16 lbf·ft)
5.
Refill the crankcase with the specified amount of the
recommended oil (see page ). Reinstall the oil filler cap and
7
dipstick.
Start the engine, and check for leaks.
6.
Stop the engine, and check the oil level as described on page .
7. 7
If necessary, add oil to bring the oil level to the upper limit mark
on the dipstick.
8
ENGLISH
AIR CLEANER
A dirty air cleaner will restrict air flow to the carburetor, reducing
engine performance. If you operate the engine in very dusty areas,
clean the air filter more often 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 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
Standard Type:
Release four latch tabs from the air cleaner cover, and remove
1.
the cover.
Remove the foam filter from the cover.
2.
Remove the paper filter from the air cleaner case.
3.
AIR CLEANER COVER
6.
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.
7.
Place the foam air filter element in the air cleaner cover, then
reinstall the paper air filter element and cover to the air cleaner
case. Hook the four latch tabs securely.
Snorkel Type:
1.
Remove the wing nut from the air cleaner cover, and remove the
cover.
2.
Remove the wing nut from the paper filter element.
3.
Remove the paper filter element from the air cleaner case.
PAPER FILTER ELEMENT
AIR CLEANER CASE
4.
Inspect the paper air filter element, and replace it if it is
AIR CLEANER COVER
WING NUTS
damaged. Always replace the paper air filter element at the
scheduled interval (see page ).
6
FOAM FILTER ELEMENT
Inspect both air filter elements, and replace them if they are
4.
PAPER FILTER ELEMENT
AIR CLEANER CASE
damaged. Always replace the paper air filter element at the
scheduled interval (see page ).
Clean the air filter elements if they are to be reused.
5.
6
Paper air filter element: Tap the filter element several times on a
hard surface to remove dirt, or blow compressed air [not
exceeding 207 kPa (2.1 kgf/cm
, 30 psi)] through the filter
element from the air cleaner case side.
Never try to brush off dirt; brushing will force dirt into the fibers.
Replace the paper element if it is excessively dirty.
5.
Clean the paper air filter element if it is to be reused.
Tap the filter element several times on a hard surface to remove
dirt, or blow compressed air [not exceeding 207 kPa (2.1 kg/cm
30 psi)] through the filter element from the inside. Never try to
brush off dirt; brushing will force dirt into the fibers.
6.
Wipe dirt from the inside of the air cleaner case and cover, using
a moist rag. Be careful to prevent dirt from entering the air duct
that leads to the carburetor.
7.
Reinstall the paper air filter element. Tighten the air filter wing
nut securely.
8.
Reinstall the air cleaner cover, and tighten the cover wing nut
securely.
,
Foam air filter element: Clean in warm soapy water, rinse, and
allow to dry thoroughly. Or clean in non-flammable solvent and
allow to dry. Do not put oil on the foam element.
ENGLISH
9
FUEL FILTER
SPARK PLUG
Inspection
1.
Check the fuel filter for water accumulation or sediment. If no
water or sediment is found, reinstall the fuel filter and the air
cleaner case.
FUEL FILTER
If the fuel filter is found with excessive water accumulation or
2.
sediment, take the engine to your authorized Honda servicing
dealer.
Recommended Spark Plugs:
ZGR5A (NGK)
J16CR-U (DENSO)
The recommended spark plugs have the correct heat range for
normal engine operating temperatures.
Incorrect spark plugs can cause engine damage.
For good performance, the spark plugs must be properly gapped
and free of deposits.
Disconnect the spark plug caps, and remove any dirt from
1.
around the spark plug area.
Remove the spark plugs with a 13/16-inch spark plug wrench.
2.
SPARK PLUG
WRENCH
SPARK PLUG CAP
Inspect the spark plugs. Replace
3.
them if damaged, badly fouled,
if the sealing washer is in poor
condition, or if the electrode is
worn.
Measure the spark plug
4.
0.70 0.80 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:
0.70 0.80 mm (0.028 0.031 in)
−−
Install the spark plug carefully,
5.
SEALING
WASHER
by hand, to avoid crossthreading.
After the spark plug is seated, tighten with a 13/16-inch spark
6.
plug wrench to compress the sealing washer.
When installing a new spark plug, tighten 1/2 turn after the spark
plug seats to compress the washer.
When reinstalling the original spark plug, tighten 1/8 1/4 turn
−
after the spark plug seats to compress the washer.
10
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)
HELPFUL TIPS & SUGGESTIONS
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
1.
Remove the spark arrester:
HIGH-MOUNT MUFFLER TYPE: Remove the special screw from
the muffler and remove the spark arrester.
SPECIAL SCREW
SPARK ARRESTER
MUFFLER
SIDE-MOUNT MUFFLER TYPE: Remove the 6 mm 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.
SPECIAL SCREWS
6 mm FLANGE BOLTS
STORING YOUR ENGINE
Storage Preparation
Proper storage preparation is essential for keeping your engine
trouble-free and looking good. The following steps will help to
keep rust and corrosion from impairing your engine’s function and
appearance, and will make the engine easier to start when you use
it again.
Cleaning
If the engine has been running, allow it to cool for at least half an
hour before cleaning. Clean all exterior surfaces, touch up any
damaged paint, and coat other areas that may rust with a light film
of oil.
Using a garden hose or pressure washing equipment can force
water into the air cleaner or muffler opening. Water in the air
cleaner will soak the air filter, and water that passes through the
air filter or muffler can enter the cylinder, causing damage.
Fuel
Gasoline will 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 problems
may occur within a few months, or even less if the gasoline was
not fresh when you filled the fuel tank.
MUFFLER
SPARK ARRESTER
2.
Use a brush to remove carbon deposits from the spark arrester
6 mm FLANGE BOLT
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 performance problems resulting
from neglected storage preparation are not covered under the
Distributor’s Limited Warranty
.
You can extend fuel storage life by adding a gasoline stabilizer
that is formulated for that purpose, or you can avoid fuel
deterioration problems by draining the fuel tank and carburetor.
Adding a Gasoline Stabilizer to Extend Fuel Storage Life
When adding a gasoline stabilizer, fill the fuel tank with fresh
gasoline. If only partially filled, air in the tank will promote fuel
deterioration during storage. If you keep a container of gasoline
for refueling, be sure that it contains only fresh gasoline.
1.
Add gasoline stabilizer following the manufacturer’s instructions.
2.
After adding a gasoline stabilizer, run the engine outdoors for 10
minutes to be sure that treated gasoline has replaced the
untreated gasoline in the carburetor.
3.
Stop the engine, and if the fuel tank is equipped with a fuel valve,
move the fuel valve to the CLOSED or OFF position.
ENGLISH
11
Draining the Fuel Tank and Carburetor
Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when handling
fuel.
Stop engine and keep heat, sparks, and flame away.
Refuel only outdoors.
Wipe up spills immediately.
1.
Disconnect the fuel line to the engine, and drain the fuel tank
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.
Storage Precautions
If your engine will be stored with gasoline in the fuel tank and
carburetor, it is important to reduce the hazard of gasoline vapor
ignition. Select a well-ventilated storage area away from any
appliance that operates with a flame, such as a furnace, water
heater, or clothes dryer. Also avoid any area with a sparkproducing electric motor, or where power tools are operated.
If possible, avoid storage areas with high humidity, because that
promotes rust and corrosion.
Keep the engine level in storage. Tilting can cause fuel or oil
leakage.
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.
2.
Loosen the carburetor drain screw, and drain the carburetor into
an approved gasoline container. After draining is completed,
tighten the carburetor drain screw.
DRAIN SCREW CARBURETOR
Engine Oil
1.
Change the engine oil (see page ).
2.
Remove the spark plugs (see page ).
Pour a tablespoon 5 10 cm
3.
−−
8
10
(5 10 cc) of clean engine oil into
each cylinder.
4.
Turn the engine for a few seconds by turning the engine switch
to the START position to distribute the oil in the cylinders.
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
3
If the fuel was drained during storage preparation, fill the tank with
fresh gasoline. If you keep a container of gasoline for refueling, be
sure it contains only fresh gasoline. Gasoline oxidizes and
deteriorates over time, causing hard starting.
If the 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.
5.
Reinstall the spark plugs.
12
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 OFF.
ENGLISH
TAKING CARE OF UNEXPECTED PROBLEMS
FUSE REPLACEMENT
ENGINE WILL NOT START
1.
Electric
starting:
Check battery
and fuse.
2.
Check control
positions.
3.
Check engine
oil level.
4.
Check fuel.
5.
Remove and
inspect spark
plugs.
6.
Take engine to
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 lever to
CLOSED position
unless the engine
is warm.
Engine switch
OFF.
Engine oil level
low (Oil Alert
stops engine).
Turn engine switch
to ON position.
Fill with the
recommended oil
to the proper level
(p. 7).
Out of fuel.
Bad 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
bad 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. Start
engine with
throttle lever in
FAST position.
Fuel filter
restricted,
carburetor
Replace or repair
faulty components
as necessary.
malfunction,
ignition
malfunction,
valves stuck, etc.
The electric starter relay circuit and battery charging circuit are
protected by a 25-ampere fuse. If the fuse burns out, the electric
starter will not operate. The engine can be started manually if the
fuse burns out, but running the engine will not charge the battery.
1.
Remove the 6 12 mm screw from the rear cover of the engine
×
switch box.
2.
Remove the fuse cover, and inspect the fuse.
If the fuse is burnt out, remove the fuse cover, then pull out and
discard the burnt-out fuse. Install a new 25-ampere fuse, and
reinstall the fuse cover.
Never use a fuse with a rating greater than 25 amperes. Serious
damage to the electrical system or a fire could result.
3.
Reinstall the rear cover. Install the 6 12 mm screw and tighten
×
it securely.
FUSE COVER
25 A FUSE
SWITCH BOX COVER
×
612mm
SPECIAL SCREW
Frequent fuse failure usually indicates a short circuit or an
overload in the electrical system. If the fuse burns out frequently,
take the engine to a servicing Honda dealer for repair.
ENGINE LACKS POWER
1.
Check air filter.
2.
Check fuel.
3.
Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
Possible Cause Correction
Filter element(s)
restricted.
Clean or replace
filter element(s)
(p. 9).
Bad fuel; engine
stored without
treating or
draining
Drain fuel tank and
carburetor (p. 12).
Refuel with fresh
gasoline (p. 7).
gasoline, or
refueled with
bad gasoline.
Fuel filter
restricted,
carburetor
Replace or repair
faulty components
as necessary.
malfunction,
ignition
malfunction,
valves stuck, etc.
ENGLISH
13
TECHNICAL & CONSUMER INFORMATION
Battery Connections for Electric Starter
TECHNICAL INFORMATION
Serial Number Location
Record the engine serial number, type and purchase date in the
space below. You will need this information when ordering parts
and when making technical or warranty inquiries.
SERIAL NUMBER &
ENGINE TYPE LOCATION
Engine serial number: __ __ __ __ __ __ __ __ __ __ __
−
Engine type: ___ ___ ___ ___
Date Purchased: ______ / ______ / ______
Use a 12-volt battery with an ampere-hour rating of at least 45 Ah.
Be careful not to connect the battery in reverse polarity, as this will
short circuit the battery charging system. Always connect the
positive ( ) battery cable to the battery terminal before
connecting the negative ( ) battery cable, so your tools cannot
＋
−
cause a short circuit if they touch a grounded part while tightening
the positive ( ) battery cable end.
＋
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.
1.
Connect the battery positive ( ) cable to the starter solenoid
＋
terminal as shown.
2.
Connect the battery negative ( ) cable to an engine mounting
−
bolt, frame bolt, or other good engine ground connection.
3.
Connect the battery positive ( ) cable to the battery positive ( )
＋＋
terminal as shown.
4.
Connect the battery negative ( ) cable to the battery negative
( ) terminal as shown.
−
−
Coat the terminals and cable ends with grease.
5.
STARTER
SOLENOID
POSITIVE ( )
BATTERY CABLE
＋
NEGATIVE ( )
BATTERY CABLE
−
14
ENGLISH
Remote Control Linkage Carburetor Modifications for High Altitude Operation
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.
REMOTE THROTTLE AND REMOTE CHOKE
BRAIDED WIRE CABLE TYPE
516mm(2)
516mm(2)
×
CABLE HOLDER (2)
CHOKE CABLE
CONTROL LEVER
46mm(2)
WIRE
HOLDER (2)
LEFT SIDE CONTROL
SOLID WIRE CABLE TYPE
516mm(2)
×
×
CABLE HOLDER (2)
CHOKE CABLE
CONTROL LEVER
THROTTLE
CABLE
CHOKE
CABLE (2)
THROTTLE
CABLE
CHOKE
CABLE
×
CABLE HOLDER (2)
WIRE HOLDER (2)
46mm(2)
×
CONTROL
LEVER
RIGHT SIDE CONTROL
516mm(2)
×
CABLE
HOLDER (2)
At high altitude, the standard carburetor air-fuel mixture will be
too rich. Performance will decrease, and fuel consumption will
increase. A very rich mixture will also foul the spark plug and
cause hard starting. Operation at an altitude that differs from that
at which this engine was certified, for extended periods of time,
may increase emissions.
High altitude performance can be improved by specific
modifications to the carburetor. If you always operate your engine
at altitudes above 1,500 meters (5,000 feet), have your servicing
dealer perform this carburetor modification. This engine, when
operated at high altitude with the carburetor modifications for
high altitude use, will meet each emission standard throughout its
useful life.
Even with carburetor modification, engine horsepower will
decrease about 3.5% for each 300-meter (1,000-foot) increase in
altitude. The effect of altitude on horsepower will be greater than
this if no carburetor modification is made.
When the carburetor has been modified for high altitude operation,
the air-fuel mixture will be too lean for low altitude use. Operation
at altitudes below 1,500 meters (5,000 feet) with a modified
carburetor may cause the engine to overheat and result in serious
engine damage. For use at low altitudes, have your servicing
dealer return the carburetor to original factory specifications.
THROTTLE
THROTTLE
CABLE
LEFT SIDE CONTROL
REMOTE THROTTLE AND MANUAL CHOKE
CHOKE KNOB ROD
CHOKE LEVER
ROD JOINT
LINKAGE BUSH
MANUAL THROTTLE AND MANUAL CHOKE
CHOKE LEVER
THROTTLE ROD
CABLE
RIGHT SIDE CONTROL
516mm
×
CABLE HOLDER
CONTROL LEVER
LOCK PIN
REASSEMBLY:
Install the lock pin in
the direction as shown.
CONTROL
LEVER
CHOKE KNOB
ROD
ROD JOINT
LINKAGE BUSH
CONTROL LEVER
ENGLISH
15
Emission Control System Information
Source of Emissions
The combustion process produces carbon monoxide, oxides of
nitrogen, and hydrocarbons. Control of hydrocarbons and oxides
of nitrogen is very important because, under certain conditions,
they react to form photochemical smog when subjected to
sunlight. Carbon monoxide does not react in the same way, but it
is toxic.
Honda utilizes lean carburetor settings and other systems to
reduce the emissions of carbon monoxide, oxides of nitrogen, and
hydrocarbons.
The U.S., California Clean Air Acts and Environment Canada
EPA, California and Canadian regulations require all
manufacturers to furnish written instructions describing the
operation and maintenance of emission control systems.
The following instructions and procedures must be followed in
order to keep the emissions from your Honda engine within the
emission standards.
Tampering and Altering
Tampering with or altering the emission control system may
increase emissions beyond the legal limit. Among those acts that
constitute tampering are:
Replacement Parts
The emission control systems on your Honda engine were
designed, built, and certified to conform with EPA, California and
Canadian emission regulations. We recommend the use of
genuine Honda parts whenever you have maintenance done.
These original-design replacement parts are manufactured to the
same standards as the original parts, so you can be confident of
their performance. The use of replacement parts that are not of the
original design and quality may impair the effectiveness of your
emission control system.
A manufacturer of an aftermarket part assumes the responsibility
that the part will not adversely affect emission performance. The
manufacturer or rebuilder of the part must certify that use of the
part will not result in a failure of the engine to comply with
emission regulations.
Maintenance
Follow the maintenance schedule on page . Remember that this
7
schedule is based on the assumption that your machine will be
used for its designed purpose. Sustained high-load or hightemperature operation, or use in unusually wet or dusty conditions,
will require more frequent service.
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
An Air Index Information hang tag/label is applied to engines
certified to an emission durability time period in accordance with
the requirements of the California Air Resources Board.
The bar graph is intended to provide you, our customer, the ability
to compare the emissions performance of available engines. The
lower the Air Index, the less pollution.
The durability description is 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 cm
125 hours [greater than 80 cm
Intermediate 125 hours [0 80 cm
250 hours [greater than 80 cm
Extended 300 hours [0 80 cm
500 hours [greater than 80 cm
−−
(0 80 cc) inclusive]
(80 cc)]
−−
(0 80 cc) inclusive]
(80 cc)]
−−
(0 80 cc) inclusive]
(80 cc)]
The Air Index Information hang tag/label must remain on the
engine until it is sold. Remove the hang tag before operating the
engine.
Specifications
GX610 (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)
[77.0 66.0 mm (3.03 2.60 in)]
12.4 kW (16.9 PS, 16.6 bhp) at 3,600 rpm
＊
39.6 N·m (4.04 kgf·m) at 2,500 rpm
＊
Without oil filter replacement:
××
388 457 452 mm
××
(15.3 18.0 17.8 in)
42.1 kg (92.8 lbs)
614 cm
(37.5 cu-in)
××
approximatly
1.1
(1.2 US qt , 1.0 Imp qt)
With oil filter replacement:
approximatly
(1.5 US qt , 1.2 Imp qt)
1.4
Cooling system
Ignition system
PTO shaft rotation
Forced air
Transistor magneto
Counterclockwise
GX620 (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
××
×
＊
＊
××
388 457 452 mm
××
(15.318.017.8in)
42.1 kg (92.8 lbs)
4-stroke, overhead valve, 2 cylinders (90° V-Twin)
614 cm
××
[77.0 66.0 mm (3.03 2.60 in)]
(37.5 cu-in)
13.5 kW (18.4 PS, 18.1 bhp) at 3,600 rpm
40.6 N·m (4.14 kgf·m, 29.9 lbf·ft) at
2,500 rpm
Without oil filter replacement:
approximatly
1.1
(1.2 US qt , 1.0 Imp qt)
With oil filter replacement:
approximatly
(1.5 US qt , 1.2 Imp qt)
1.4
Cooling system
Ignition system
PTO shaft rotation
Forced air
Transistor magneto
Counterclockwise
GX670 (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
××
×
＊
＊
××
412 471 457 mm
××
(16.218.518.0in)
43.5 kg (95.9 lbs)
4-stroke, overhead valve, 2 cylinders (90° V-Twin)
670 cm
××
[77.0 72.0 mm (3.03 2.83 in)]
(40.9 cu-in)
15.3 kW (20.8 PS, 20.5 bhp) at 3,600 rpm
46.0 N·m (4.69 kgf·m, 33.9 lbf·ft) at
2,500 rpm
Without oil filter replacement:
approximatly
1.1
(1.2 US qt , 1.0 Imp qt)
With oil filter replacement:
approximatly
(1.5 US qt , 1.2 Imp qt)
1.4
Cooling system
Ignition system
PTO shaft rotation
＊
The power rating of the engine indicated in this document is the
Forced air
Transistor magneto
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.
ENGLISH
17
Tuneup Specifications
GX610/620/670
SPECIFICATIONITEM
Spark plug gap
0.70 0.80 mm
(0.028 0.031 in)
Idle speed
Valve clearance
(cold)
1,400 150 rpm
IN: 0.15 0.02 mm
EX: 0.20 0.02 mm
Other specifications
Quick Reference Information
Fuel
Unleaded gasoline (Refer to page 7 ).
U. S.
Except
U. S.
Engine oil
SAE 10W-30, API SJ or SL, for general use.
Refer to page 8.
Spark plug
ZGR5A (NGK)
J16CR-U (DENSO)
Maintenance
Before each use:
Check engine oil level. Refer to page 7.
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 6.
MAINTENANCE
−
Refer to page 10
−
±
See your authorized
Honda dealer
±
±
See your authorized
Honda dealer
No other adjustments needed.
Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher
Wiring Diagrams
3 A Charge Coil and Switch Box Type
OFF
ON
START
Bl
Black
Y
Yellow
Bu
Blue
G
Green
R
Red
W
White
MAIN FUSE
(A)
ENGINE SWITCH
(B)
CONTROL BOX
(C)
OIL ALERT UNIT
(D)
OIL LEVEL SWITCH
(E)
FUEL CUT
(F)
SOLENOID
STARTER MOTOR
(G)
BATTERY
(H)
CHARGE COIL (3A)
(I)
(J)
LEFT IGNITION
COIL
LEFT SPARK PLUG
(K)
(L)
RIGHT IGNITION
COIL
RIGHT SPARK PLUG
(M)
ENGINE STOP DIODE
(N)
RECTIFIER
(O)
Br
O
Lb
Lg
P
Gr
Brown
Orange
Light blue
Light green
Pink
Gray
20 A Charge Coil and Switch Box Type
OFF
ON
START
Bl
Black Brown
Y
Yellow
Bu
Blue
G
Green
R
Red
W
White
MAIN FUSE
(A)
ENGINE SWITCH
(B)
CONTROL BOX
(C)
OIL ALERT UNIT
(D)
OIL LEVEL SWITCH
(E)
FUEL CUT
(F)
SOLENOID
STARTER MOTOR
(G)
BATTERY
(H)
CHARGE COIL (3A)
(I)
(J)
LEFT IGNITION
COIL
LEFT SPARK PLUG
(K)
(L)
RIGHT IGNITION
COIL
RIGHT SPARK PLUG
(M)
ENGINE STOP DIODE
(N)
REGULATOR/
(O)
RECTIFIER
Br
O
Lb
Lg
P
Gr
Orange
Light blue
Light green
Pink
Gray
18
ENGLISH
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