HONDA GX100 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., 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
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
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15
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