GX100
Table of contents
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INTRODUCTION
Thank you for purchasing a Honda engine. We want to help you to
get the best results from your new engine and to operate it safely.
This manual contains information on how to do that; please read it
carefully before operating the engine. If a problem should arise, or
if you have any questions about your engine, consult an
authorized Honda servicing dealer.
All information in this publication is based on the latest product
information available at the time of printing. Honda Motor Co., Ltd.
reserves the right to make changes at any time without notice and
without incurring any obligation. No part of this publication may
be reproduced without written permission.
This manual should be considered a permanent part of the engine
and should remain with the engine if resold.
Review the instructions provided with the equipment powered by
this engine for any additional information regarding engine
startup, shutdown, operation, adjustments or any special
maintenance instructions.
United States, Puerto Rico, and U.S. Virgin Islands:
We suggest you read the warranty policy to fully understand its
coverage and your responsibilities of ownership. The warranty
policy is a separate document that should have been given to you
by your dealer.
SAFETY MESSAGES
OWNER’S MANUAL
MANUEL DE L’UTILISATEUR
MANUAL DEL PROPIETARIO
GX100
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.
CONTENTS
.......................INTRODUCTION .1
................SAFETY MESSAGES .1
..........SAFETY INFORMATION .2
COMPONENT & CONTROL
................................LOCATION .2
................................FEATURES .3
BEFORE OPERATION
....................................CHECKS .3
..............................OPERATION .4
SAFE OPERATING
.....................PRECAUTIONS .4
THE IMPORTANCE OF
....................MAINTENANCE .6
MAINTENANCE
............................SCHEDULE .6
...........................REFUELING .7
...........................ENGINE OIL .7
............Recommended Oil .7
..................Oil Level Check .8
.........................Oil Change .8
........................AIR CLEANER .8
..........................Inspection .8
............................Cleaning .9
......STARTING THE ENGINE .4
.....SETTING ENGINE SPEED .5
......STOPPING THE ENGINE .5
.....SERVICING YOUR ENGINE .6
......MAINTENANCE SAFETY .6
.......SAFETY PRECAUTIONS .6
........................SPARK PLUG .9
.............SPARK ARRESTER .10
HELPFUL TIPS &
......................SUGGESTIONS .10
...STORING YOUR ENGINE .10
................TRANSPORTING .11
TAKING CARE OF
....UNEXPECTED PROBLEMS .12
..TECHNICAL INFORMATION .12
.....Serial Number Location .12
Carburetor Modifications for
.....High Altitude Operation .13
Emission Control System
.........................Information .13
..............................Air Index .14
.....................Specifications .14
........Tuneup Specifications .14
Quick Reference
.........................Information .15
................Wiring Diagrams .15
.CONSUMER INFORMATION .16
Distributor/Dealer Locator
.........................Information .16
Customer Service
.........................Information .16
2006 Honda Motor Co., Ltd. All Rights Reserved
37Z4E601
00X37-Z4E-6010
−
GX100U
ENGLISH
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.
FUEL FILLER CAP
AIR CLEANER
OIL FILLER CAP/
DIPSTICK
FUEL TANK
STARTER GRIP
SPARK PLUG
MUFFLER
(inside the cover)
RECOIL STARTER
ENGINE CONTROLS
CHOKE LEVER
THROTTLE LEVER ENGINE SWITCH
FUEL VALVE LEVER
2
ENGLISH
BEFORE OPERATION CHECKSFEATURES
OIL ALERT SYSTEM (applicable types)
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.
8
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.
2.
Remove any excessive dirt or debris, especially around the
muffler and recoil starter.
3.
Look for signs of damage.
4.
Check that all shields and covers are in place, and all nuts, bolts,
and screws are tightened.
Check the Engine
1.
Check the fuel level (see page ). Starting with a full tank will
help to eliminate or reduce operating interruptions for refueling.
2.
Check the engine oil level (see page ). Running the engine
with a low oil level can cause engine damage.
The Oil Alert system (applicable types) will automatically stop
the engine before the oil level falls below 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
element will restrict air flow to the carburetor, reducing engine
performance.
Check the equipment powered by this engine.
4.
7
8
8
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
Turn the engine switch to the ON position.
3.
SAFE OPERATING PRECAUTIONS
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
Move the fuel valve lever to the ON position.
1.
FUEL VALVE LEVER
OONN
OONN
ENGINE SWITCH
4.
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.
(EQUIPMENT SIDE)
DDiirreeccttiioonn ttoo ppuullll
OONN
To start a cold engine, move the choke lever to the CLOSED
2.
OONN
position.
CHOKE LEVER
OPEN
CLOSED
OPEN
To restart a warm engine, leave the choke lever in the OPEN
position.
CCLLOOSSEEDD
STARTER GRIP
Do not allow the starter grip to snap back against the engine.
Return it gently to prevent damage to the starter.
5.
If the choke lever was moved to the CLOSED position to start the
engine, gradually move it to the OPEN position as the engine
warms up.
CHOKE LEVER
OPEN
OPEN
4
ENGLISH
SETTING ENGINE SPEED STOPPING THE 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.
For engine speed recommendations, refer to the instructions
provided with the equipment powered by this engine.
MMIINN..
MAX.
THROTTLE LEVER
MIN.
MAX.
To stop the engine in an emergency, simply turn the engine switch
to the OFF position. Under normal conditions, use the following
procedure.
Move the throttle lever to the MIN. position.
1.
Some engine applications use a remote-mounted throttle
control rather than the engine-mounted throttle lever shown
here.
MMIINN..
Turn the engine switch to the OFF position.
2.
THROTTLE LEVER
MMIINN..
OOFFFF
Turn the fuel valve lever to the OFF position.
3.
OOFFFF
FUEL VALVE LEVER
OOFFFF
OOFFFF
ENGINE SWITCH
ENGLISH
5
SERVICING YOUR ENGINE
THE IMPORTANCE OF MAINTENANCE
Good maintenance is essential for safe, economical and troublefree operation. It will also help reduce pollution.
Improper maintenance, or failure to correct a
problem before operation, can cause a malfunction in
which you can be seriously hurt or killed.
Always follow the 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.
MAINTENANCE SCHEDULE
REGULAR SERVICE PERIOD (3)
Perform at every
indicated month or
operating hour interval,
whichever comes first.
ITEM
Engine oil
Air cleaner
Spark plug
Timing belt
Spark arrester
(applicable
types)
Idle speed
Valve clearance
Combustion
chamber
Fuel tank &
filter
Fuel tube
Check level
Change
Check
Clean
Replace
Check-adjust
Replace
Check
Clean
Check-adjust
Check-adjust
Clean
Clean
Check
Each
use
Every 2 years (Replace if necessary) (2)
Every 3
First
months
month
or
or
100 hrs.
50 hrs.
20 hrs.
(1)
After every 300 hrs. (2) (4)
After every 300 hrs. (2)
Every 6
months
or
(2)
Every
year
200 hrs.
Service more frequently when used in dusty areas.(1)
(2)
These items should be serviced by your Honda servicing
dealer, unless you have the proper tools and are mechanically
proficient. Refer to the Honda shop manual for service
procedures.
(3)
For commercial use, log hours of operation to determine
proper maintenance intervals.
Refer
to
page
or
8
8
9
(1)
9
Shop
manual
10
(2)
Shop
manual
(2)
Shop
manual
Shop
manual
Shop
manual
Shop
manual
Failure to properly follow maintenance instructions
and precautions can cause you to be seriously hurt or
killed.
Always follow the procedures and precautions in this
owner’s manual.
SAFETY PRECAUTIONS
Make sure the engine is off before you begin any maintenance
or repairs. This will eliminate several 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 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 genuine
Honda parts or their equivalents for repair and replacement.
6
(4)
Check that there is no crack and abnormal wear-out in the belt,
and replace if it is abnormal.
Failure to follow this maintenance schedule could result in nonwarrantable failures.
ENGLISH
REFUELING
Recommended Fuel
Unleaded gasoline
U.S.
Except U.S.
Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher
Refuel carefully to avoid spilling fuel. Do not fill the fuel tank
completely. It may be necessary to lower the fuel level depending
on operating conditions. After refueling, tighten the fuel filler cap
securely.
Keep gasoline away from appliance pilot lights, barbecues,
electric appliances, power tools, etc.
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.
Spilled fuel is not only a fire hazard, it causes environmental
damage. Wipe up spills immediately.
ENGINE OIL
Oil is a major factor affecting performance and service life. Use
4-stroke automotive detergent oil.
Recommended Oil
SAE Viscosity Grades
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
AMBIENT TEMPERATURE
equivalent).
SAE 10W-30 is recommended for general use. Other viscosities
shown in the chart may be used when the average temperature in
your area is within the indicated range.
The recommended operating range of this engine is 15°C to
−
40°C (5°F to 104°F).
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 oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.
1.
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.
2.
Add fuel to the bottom of the fuel level mark of the fuel tank. Do
not overfill. Wipe up spilled fuel before starting the engine.
FUEL LEVEL MARK
MAXIMUM
FUEL LEVEL
FUEL FILLER CAP
ENGLISH
7
Oil Level Check
4.
Install the oil filler cap/dipstick and tighten securely.
Check the engine oil level with the engine stopped and in a level
position.
1.
Remove the oil filler cap/dipstick and wipe it clean.
2.
Insert the oil filler cap/dipstick into the oil filler neck as shown,
but do not screw it in, then remove it to check the oil level.
3.
If the oil level is near or below the lower limit mark on the
dipstick, fill with the recommended oil (see page ) to the
7
upper limit mark (bottom edge of the oil fill hole). Do not overfill.
4.
Reinstall the oil filler cap/dipstick.
OIL FILLER CAP/DIPSTICK
UPPER LIMIT
OIL FILL HOLE
(bottom edge)
LOWER LIMIT
OIL FILLER CAP/DIPSTICK
OIL FILL HOLE
(bottom edge)
SEALING WASHER
DRAIN PLUG
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 element, or with a
damaged air filter element, 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
Running the engine with a low oil level can cause engine damage.
The Oil Alert system (applicable types) will automatically stop the
engine before the oil level falls below the safe limit. However, to
avoid the inconvenience of an unexpected shutdown, always
check the engine oil level before startup.
Oil Change
Drain the used oil when the engine is warm. Warm oil drains
quickly and completely.
Place a suitable container below the engine to catch the used oil,
1.
then remove the oil filler cap/dipstick, oil drain plug and washer.
Allow the used oil to drain completely, then reinstall the oil drain
2.
plug and new washer, and tighten the oil drain plug securely.
Please dispose of used motor oil in a manner that is compatible
with the environment. We suggest you take used oil in a sealed
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.
3.
With the engine in a level position, fill with the recommended oil
to the upper limit mark (bottom edge of the oil fill hole) on the
dipstick (see page ).
7
Remove the two screws and the air cleaner cover. Inspect the air
filter elements. Clean or replace dirty air filter elements. Always
replace damaged air filter elements.
Refer to page for instructions that apply to the air cleaner and
9
filter service.
Reinstall the air filter elements and air cleaner cover.
AIR CLEANER CASE
PAPER AIR FILTER ELEMENT
FOAM AIR FILTER ELEMENT
AIR CLEANER COVER
SCREWS
Running the engine with a low oil level can cause engine
damage.
The Oil Alert system (applicable types) will automatically stop
the engine before the oil level falls below the safe limit.
However, to avoid the inconvenience of an unexpected
shutdown, fill to the upper limit, and check the oil level regularly.
8
ENGLISH
Cleaning SPARK PLUG
1.
Remove two screws from the air cleaner cover, and remove the
cover.
2.
Remove the foam air filter element from the cover.
3.
Remove the paper air filter element from the air cleaner case.
AIR CLEANER CASE
PAPER AIR FILTER ELEMENT
FOAM AIR FILTER ELEMENT
SCREWS
Inspect both air filter elements, and replace them if they are
4.
AIR CLEANER COVER
damaged. Always replace the paper air filter element at the
scheduled interval (see page ).
5.
Clean the air filter elements if they are to be reused.
6
Paper air filter element: Tap the paper air filter element several
times on a hard surface to remove dirt, or blow compressed air
[not exceeding 207 kPa (2.1 kgf/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 air
filter element if it is excessively dirty.
Foam air filter element: Clean in warm soapy water, rinse, and
allow to dry thoroughly. Or clean in nonflammable solvent and
allow to dry. Do not put oil on the foam air filter element.
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.
Place the foam air filter element to the air cleaner cover, then
7.
reinstall the paper air filter element and cover to the air cleaner
case.
Recommended Spark Plugs:
CR5HSB (NGK)
U16FSR-UB (DENSO)
The recommended spark plug has the correct heat range for
normal engine operating temperatures.
An incorrect spark plug can cause engine damage.
For good performance, the spark plug must be properly gapped
and free of deposits.
1.
Disconnect the spark plug cap, and remove any dirt from around
the spark plug area.
Remove the spark plug with a 5/8-inch spark plug wrench.
2.
SPARK PLUG WRENCH
SPARK PLUG GAP
3.
Inspect the spark plug.
SIDE ELECTRODE
Replace it if damaged or
badly fouled, if the sealing
washer is in poor condition,
0.60 0.70 mm
−
(0.024 0.028 in)
−
or if the electrode is worn.
4.
Measure the spark plug
electrode gap with a wiretype feeler gauge. Correct the
gap, if necessary, by carefully
bending the side electrode.
SEALING
WASHER
The gap should be:
0.60 0.70 mm (0.024 0.028 in)
−−
5.
Install the spark plug carefully,
by hand, to avoid crossthreading.
After the spark plug is seated, tighten with a 5/8-inch spark plug
6.
wrench to compress the sealing washer.
Install the air cleaner cover, and tighten the two screws securely.
8.
When installing a new spark plug, tighten 1/2 turn after the spark
7.
plug seats to compress the washer.
When reinstalling the original spark plug, tighten 1/8 1/4 turn
8.
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.
9.
Attach the spark plug cap to the spark plug.
ENGLISH
−
9
SPARK ARRESTER (applicable types)
HELPFUL TIPS & SUGGESTIONS
Your engine is not factory-equipped with a spark arrester. In some
areas, it is illegal to operate an engine without a spark arrester.
Check local laws and regulations. A spark arrester is available
from authorized Honda servicing dealers.
The spark arrester must be serviced every 100 hours to keep it
functioning as designed.
If the engine has been running, the muffler will be hot. Allow it to
cool before servicing the spark arrester.
Spark Arrester Removal
1.
Remove the three 5 mm bolts from the muffler protector and
remove the muffler protector.
Remove the special screw from the spark arrester, and remove
2.
the spark arrester from the muffler.
MUFFLER
MUFFLER PROTECTOR
SPECIAL SCREW
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.
SPARK ARRESTER
Spark Arrester Cleaning & Inspection
SPARK ARRESTER SCREEN
1.
Use a brush to remove carbon
deposits from the spark arrester
screen. Be careful not to damage
the screen. Replace the spark
arrester if it has breaks or holes.
Install the spark arrester and muffler protector in the reverse
2.
order of disassembly.
5mm
BOLTS
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.
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.
10
3.
Stop the engine.
ENGLISH
Draining the Fuel Tank and Carburetor
Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when handling
fuel.
Stop engine and keep heat, sparks, and flame away.
Handle fuel only outdoors.
Wipe up spills immediately.
1.
Place an approved gasoline container below the carburetor, and
use a funnel to avoid spilling fuel.
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.
Unless all fuel has been drained from the fuel tank, leave the fuel
valve lever in the OFF position to reduce the possibility of fuel
leakage.
2.
Move the fuel valve lever to the ON position.
3.
Loosen the carburetor drain screw, and drain the carburetor into
an approved gasoline container. After draining is completed,
tighten the carburetor drain screw.
CARBURETOR
DRAIN HOSE
DRAIN SCREW
SCREWDRIVER
Engine Oil
1.
Change the engine oil (see page ).
2.
Remove the spark plug (see page ).
3.
Pour a tablespoon 5 10 cm
−−
8
9
(5 10 cc) of clean engine oil into
the cylinder.
Keep the engine level in storage. Tilting can cause fuel or oil
leakage.
With the engine and exhaust system cool, cover the engine to
keep out dust. A hot engine and exhaust system can ignite or melt
some materials. Do not use sheet plastic as a dust cover. A
nonporous cover will trap moisture around the engine, promoting
rust and corrosion.
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 cylinder was coated with oil during storage preparation, the
engine will 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.
4.
Pull the starter grip several times to distribute the oil in the
cylinder.
5.
Reinstall the spark plug.
6.
Pull the starter grip slowly until resistance is felt and the notch
on the flywheel aligns with the hole for a bolt at the top of the
fan cover. This will close the valves so moisture cannot enter the
engine cylinder. Return the starter grip gently.
Align the notch on the
flywheel with the hole
on top of the fan cover.
Keep the engine level when transporting to reduce the possibility
of fuel leakage. Turn the fuel valve to the OFF position (see
page ).
5
ENGLISH
11
TAKING CARE OF UNEXPECTED PROBLEMS TECHNICAL INFORMATION
ENGINE WILL
NOT START
1.
Check control
positions.
2.
Check engine
oil level.
3.
Check fuel.
4.
Remove and
inspect spark
plug.
5.
Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
Possible Cause Correction
Fuel valve OFF.
Move lever to ON
position.
Choke open.
Move lever to
CLOSED position
unless the engine
is warm.
Engine switch
OFF. (on the
Turn engine switch
to ON position.
equipment)
Engine oil level
low (Oil Alert
models).
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. 11).
Refuel with fresh
gasoline(p. 7).
gasoline, or
refueled with
bad gasoline.
Spark plug faulty,
fouled, or
Gap or replace
spark plug (p. 9).
improperly
gapped.
Spark plug wet
with fuel
(flooded engine).
Dry and reinstall
spark plug. Start
engine with
throttle lever in
MAX. position,
with choke lever in
OPEN position.
Fuel filter
restricted,
carburetor
Replace or repair
faulty components
as necessary.
malfunction,
ignition
malfunction,
valves stuck, etc.
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.
ENGINE TYPE LOCATION
Engine serial number: __ __ __ __ __ __ __ __ __ __ __
ENGINE SERIAL NUMBER LOCATION
−
Engine type: ___ ___ ___ ___
Date Purchased: ______ / ______ / ______
ENGINE LACKS
POWER
1.
Check air filter.
2.
Check fuel.
3.
Take engine to
an authorized
Honda
servicing
dealer, or refer
to shop
manual.
12
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. 11).
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
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.
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.
Emission Control System Information
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.
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.
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.
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
6
schedule is based on the assumption that your machine will be
used for its designed purpose. Sustained high-load or hightemperature operation, or use in unusually wet or dusty conditions,
will require more frequent service.
ENGLISH
13
SpecificationsAir 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
Descriptive Term
Moderate
for additional information.
Applicable to Emissions Durability Period
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
1,000 hours [225 cm
Emission Control System
−−
(0 80 cc) inclusive]
(80 cc)]
−−
(0 80 cc) inclusive]
(80 cc)]
−−
(0 80 cc) inclusive]
(80 cc)]
(225 cc) and greater]
The Air Index Information hang tag/label must remain on the
engine until it is sold. Remove the hang tag before operating the
engine.
SD-Type (basic type)
Length Width
××
Height
Dry weight
Engine type
Displacement
[Bore Stroke]
×
Max. output
Max. torque
Max. rotation with no
load
Engine oil capacity
Fuel tank capacity
Fuel consumption
Cooling system
Ignition system
PTO shaft rotation
Tuneup Specifications
Spark plug gap
0.60 0.70 mm
(0.024 0.028 in)
Idle speed
Valve clearance
(cold)
1,550 150 rpm
IN: 0.15 0.04 mm
EX: 0.20 0.04 mm
Other
specifications
287 304 418 mm
××
(11.312.016.5in)
××
10.7 kg (23.6 lbs)
4-stroke, overhead valve, single cylinder
98 cm
[5640mm(2.21.6in)]
××
(6.0 cu-in)
2.2 kW (3.0 PS, 3.0 bhp) at 3,600 rpm
5.7 N·m (0.59 kgf·m, 4.3 lbf·ft) at
3,600 rpm
4,000 200 rpm
±
0.40
(0.42 US qt , 0.35 Imp qt)
0.77
(0.203 US gal , 0.169 Imp gal)
327 g/kWh (240 g/PSh, 0.54 lb/hph)
Forced air
Transistorized magneto
Counterclockwise
MAINTENANCESPECIFICATIONITEM
−
Refer to page: 9
−
±
Refer to shop
manual
±
±
See your
authorized
Honda dealer
No other adjustments needed.
14
ENGLISH
Quick Reference Information Wiring Diagrams
Fuel
Engine oil
Spark plug
Maintenance
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 7.
CR5HSB (NGK)
U16FSR-UB (DENSO)
Before each use:
Check engine oil level. Refer to page 8.
Check air filter. Refer to page 8.
First 20 hours:
Change engine oil. Refer to page 8.
Subsequent:
Refer to the maintenance schedule on page 6.
Without Oil Alert
OFF
ON
With Oil Alert
(5) (4)
(1)
(1)
(3)
(2)
(3)
(2)
OFF
ON
ENGINE SWITCH OIL ALERT UNIT
(1)
IGNITION COIL
(2)
SPARK PLUG
(3)
Bl
Y
Bu
G
R
W
Black
Yellow
Blue
Green
Red
White
Br
O
Lb
Lg
P
Gr
(4)
OIL LEVEL SWITCH
(5)
Brown
Orange
Light blue
Light green
Pink
Gray
ENGLISH
15
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