GX22･31_cover 03.3.5 11:36 ページ 1 31ZM3613 DIC 157 Owner’s Manual GX22•GX31 31ZM3613 00X31-ZM3-6130 N2eY15000.2003.01 Printed in Japan o2003 Honda Motor Co., Ltd.
01/04/03 12:06:07 31ZM3601_001 The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm. Keep this owner’s manual handy, so you can refer to it at any time. This owner’s manual is considered a permanent part of the engine and should remain with the engine if resold. The information and specifications included in this publication were in effect at the time of approval for printing. Honda Motor Co., Ltd.
01/04/03 12:06:16 31ZM3601_002 INTRODUCTION Congratulations on your selection of a Honda engine. We are certain you will be pleased with your purchase of one of the finest engines on the market. We want to help you get the best results from your new engine and to operate it safely. This manual contains the information on how to do that; please read it carefully. As you read this manual, you will find information preceded by a symbol.
01/04/03 12:06:29 31ZM3601_003 INTRODUCTION A FEW WORDS ABOUT SAFETY Your safety and the safety of others are very important. And using this engine safely is an important responsibility. To help you make informed decisions about safety, we have provided operating procedures and other information on labels and in this manual. This information alerts you to potential hazards that could hurt you or others.
02/12/17 12:46:27 31ZM3601_004 CONTENTS ENGINE SAFETY ........................................................................................ 5 IMPORTANT SAFETY INFORMATION ................................................. 5 CONTROLS & FEATURES ......................................................................... 7 COMPONENT & CONTROL LOCATIONS ............................................. 7 CONTROLS .............................................................................................
01/04/03 12:06:37 31ZM3601_005 CONTENTS HELPFUL TIPS & SUGGESTIONS ...........................................................40 STORING YOUR ENGINE .................................................................... 40 Storage Preparation ......................................................................... 40 Storage Precautions ......................................................................... 43 Removal From Storage ....................................................................
01/04/03 12:06:45 31ZM3601_006 ENGINE SAFETY IMPORTANT SAFETY INFORMATION Most accidents with engines can be prevented if you follow all instructions in this manual and on the engine. Some of the most common hazards are discussed below, along with the best way to protect yourself and others. Owner Responsibilities Honda engines are designed to give safe and dependable service if operated according to instructions. Read and understand this owner’s manual before operating the engine.
02/12/17 12:46:34 31ZM3601_007 ENGINE SAFETY Hot Exhaust The muffler becomes very hot during operation and remains hot for a while after stopping the engine. Be careful not to touch the muffler while it is hot. Let the engine cool before storing it indoors. Carbon Monoxide Hazard Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of exhaust gas. Never run the engine in a closed garage or confined area.
01/04/03 12:06:58 31ZM3601_008 CONTROLS & FEATURES COMPONENT & CONTROL LOCATIONS Horizontal type: SPARK PLUG CHOKE LEVER AIR CLEANER MUFFLER (inside the cover) STARTER GRIP PRIMING BULB FUEL FILLER CAP FUEL TANK RECOIL STARTER OIL FILLER CAP Vertical type: RECOIL STARTER SPARK ARRESTER STARTER GRIP MUFFLER (inside the cover) FUEL FILLER CAP SPARK PLUG OIL FILLER CAP FUEL TANK PRIMING BULB CHOKE LEVER AIR CLEANER 7
01/04/03 12:07:05 31ZM3601_009 CONTROLS & FEATURES CONTROLS Choke Lever The choke lever opens and closes the choke valve in the carburetor. The CLOSED position enriches the fuel mixture for starting a cold engine. The OPEN position provides the correct fuel mixture for operation after starting, and for restarting a warm engine.
02/12/17 12:46:41 31ZM3601_010 CONTROLS & FEATURES Throttle Lever The throttle lever controls engine speed. Moving the throttle lever in the directions shown makes the engine run faster or slower. The throttle lever shown here will be connected to a remote control on the equipment powered by this engine. Refer to the instructions provided with that equipment for remote control information.
01/04/03 12:07:19 31ZM3601_011 CONTROLS & FEATURES Recoil Starter Grip Pulling the starter grip operates the recoil starter to crank the engine.
01/04/03 12:07:24 31ZM3601_012 CONTROLS & FEATURES FEATURES Centrifugal Clutch The centrifugal clutch automatically engages and transmits power when engine speed is increased above approximately 4,000 rpm. At idle speed, the clutch is disengaged. Do not run the engine without mounting it on equipment that includes the centrifugal clutch drum and housing, or centrifugal force will cause the clutch shoes to contact and damage the engine case.
01/04/03 12:07:34 31ZM3601_013 BEFORE OPERATION 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.
01/04/03 12:07:41 31ZM3601_014 BEFORE OPERATION Check the Engine Check the engine oil level (see page 24 ). Running the engine with a low oil level can cause engine damage. Check the air filter (see page 29 ). A dirty air filter will restrict air flow to the carburetor, reducing engine performance. Check that all nuts, bolts, and screws are tightened. Check the fuel level. Starting with a full tank will help to eliminate or reduce operating interruptions for refueling.
01/04/03 12:07:49 31ZM3601_015 OPERATION SAFE OPERATING PRECAUTIONS Before operating the engine for the first time, please review the IMPORTANT SAFETY INFORMATION on page 5 and the chapter titled BEFORE OPERATION. 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.
01/04/03 12:07:57 31ZM3601_016 OPERATION 2. Press the priming bulb repeatedly until fuel can be seen in the clearplastic fuel-return tube. FUEL RETURN TUBE (clear plastic tube) PRIMING BULB 3. Turn the ignition switch to the ON position. 4. Pull the starter grip lightly until you feel resistance, then pull briskly. Return the starter grip gently.
02/12/17 12:46:54 31ZM3601_017 OPERATION 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 Hot Restart If the engine is operated at higher ambient temperatures then turned off and allowed to sit for a short time, if may not restart on the first pull. If necessary, use the following procedure: The ignition switch and the throttle lever are located on the equipment not on the engine.
01/04/03 12:08:08 31ZM3601_018 OPERATION STOPPING THE ENGINE To stop the engine in an emergency, simply turn the ignition switch on the equipment to the OFF position. Under normal conditions, use the following procedure. 1. Move the throttle lever to the SLOW position. The throttle lever shown here will be connected to a remote control on the equipment powered by this engine. Refer to the instructions provided with that equipment for remote control information. THROTTLE LEVER SLOW 2.
01/04/03 12:08:15 31ZM3601_019 OPERATION SETTING ENGINE SPEED Position the throttle lever for the desired engine speed. The throttle lever shown here will be connected to a remote control on the equipment powered by this engine. Refer to the instructions provided with that equipment for remote control information and for engine speed recommendations. For engine speed recommendations, refer to the instructions provided with the equipment powered by this engine.
01/04/03 12:08:23 31ZM3601_020 SERVICING YOUR HONDA ENGINE THE IMPORTANCE OF MAINTENANCE Good maintenance is essential for safe, economical, and trouble-free operation. It will also help reduce air pollution. 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 follow the inspection and maintenance recommendations and schedules in this owner’s manual.
01/04/03 12:08:35 31ZM3601_021 SERVICING YOUR HONDA ENGINE 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 the owner’s manual.
01/04/03 12:08:47 31ZM3601_022 SERVICING YOUR HONDA ENGINE MAINTENANCE SCHEDULE REGULAR SERVICE PERIOD (3) ITEM Perform at every indicated month or operating hour interval, whichever comes first.
01/04/03 12:08:59 31ZM3601_023 SERVICING YOUR HONDA ENGINE REFUELING Fuel tank capacities GX22: 0.119 US gal (0.45 0.159 US gal (0.60 GX31: 0.172 US gal (0.65 0.159 US gal (0.60 , 0.099 Imp gal) , 0.132 Imp gal) , 0.143 Imp gal) , 0.132 Imp gal) for horizontal types for vertical types for horizontal types for vertical types Check the fuel level by looking through the translucent fuel tank. If the fuel level is low, refuel in a well-ventilated area with the engine stopped.
01/04/03 12:09:10 31ZM3601_024 SERVICING YOUR HONDA ENGINE Never refuel the engine inside a building where gasoline fumes may reach flames or sparks. 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. Fuel can damage paint and plastic. Be careful not to spill fuel when filling your fuel tank. Damage caused by spilled fuel is not covered under warranty.
01/04/03 12:09:22 31ZM3601_025 SERVICING YOUR HONDA ENGINE ENGINE OIL LEVEL CHECK Check the engine oil level before each use, or every 10 hours if operated continuously. Check the engine oil level with the engine stopped and in a level position. For the vertical type engine, turn it 90 degrees with the fuel tank downward before performing engine oil level check. 1. Remove the oil filler cap/dipstick and wipe it clean. 2. Insert and remove the dipstick without screwing it into the filler neck.
01/04/03 12:09:27 31ZM3601_026 SERVICING YOUR HONDA ENGINE 4. Reinstall the oil filler cap/dipstick securely. Running the engine with a low or excessive oil level can cause engine damage.
01/04/03 12:09:34 31ZM3601_027 SERVICING YOUR HONDA ENGINE ENGINE OIL CHANGE Drain the used oil while the engine is warm. Warm oil drains quickly and completely. For the vertical type engine, turn it 90 degrees with the fuel tank downward before performing engine oil change. 1. Check that the fuel tank cap is tightened securely. 2. Place a suitable container next to the engine to catch the used oil. 3.
01/04/03 12:09:46 31ZM3601_028 SERVICING YOUR HONDA ENGINE 4. With the engine in a level position, fill to the edge of the oil filler hole with the recommended oil (see page 28). Add the engine oil slowly to avoid overflowing, as the engine oil tank capacity is small. Engine oil capacity: 0.11 US qt (0.10 , 0.09 Imp qt) Running the engine with a low or excessive oil level can cause engine damage. 5. Reinstall the oil filler cap/dipstick securely.
01/04/03 12:09:54 31ZM3601_029 SERVICING YOUR HONDA ENGINE ENGINE OIL RECOMMENDATIONS Oil is a major factor affecting performance and service life. Use 4-stroke automotive detergent oil. 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 recommended range. SAE Viscosity Grades AMBIENT TEMPERATURE The SAE oil viscosity and service classification are in the API label on the oil container.
01/04/03 12:10:02 31ZM3601_030 SERVICING YOUR HONDA ENGINE AIR FILTER INSPECTION Press the latch tab on the top of the air cleaner cover, and remove the cover. Check the filter to be sure it is clean and in good condition. If the filter is dirty, clean it as described on page 30. Replace the filter if it is damaged. Reinstall the filter and air cleaner cover. Operating the engine without an air filter, or with a damaged air filter, will allow dirt to enter the engine, causing rapid engine wear.
01/04/03 12:10:09 31ZM3601_031 SERVICING YOUR HONDA ENGINE AIR FILTER CLEANING A dirty air filter will restrict air flow to the carburetor, reducing engine performance. If you operate the engine in very dusty areas, clean the air filter more than specified in the MAINTENANCE SCHEDULE. 1. Clean the air filter in warm soapy water, rinse, and allow to dry thoroughly. Or clean in nonflammable solvent and allow to dry. 2. Dip the air filter in clean engine oil, then squeeze out all excess oil.
01/04/03 12:10:18 31ZM3601_032 SERVICING YOUR HONDA ENGINE SPARK PLUG SERVICE Recommended spark plug: CR5HSB (NGK) U16FSR-UB (DENSO) An incorrect spark plug can cause engine damage. 1. Disconnect the spark plug cap, and remove any dirt from around the spark plug area. 2. Remove the spark plug with a 5/8-inch spark plug wrench. SPARK PLUG SPARK PLUG CAP 3. Inspect the spark plug. Replace it if the electrodes are worn, or if the insulator is cracked or chipped.
01/04/03 12:10:23 31ZM3601_033 SERVICING YOUR HONDA ENGINE 6. After the spark plug seats, tighten with a 5/8-inch spark plug wrench to compress the washer. If reinstalling the used spark plug, tighten 1/8−1/4 turn after the spark plug seats. If installing a new spark plug, tighten 1/2 turn after the spark plug seats. A loose spark plug can overheat and damage the engine. Overtightening the spark plug can damage the threads in the cylinder head. 7. Attach the spark plug cap.
01/04/03 12:10:31 31ZM3601_034 SERVICING YOUR HONDA ENGINE COOLING FIN INSPECTION Inspect the engine cooling fins, and clean out debris if they are clogged. If it is necessary to remove the top cover for better access to the cooling fins, refer to the disassembly instructions on pages 37 and 38 .
01/04/03 12:10:38 31ZM3601_035 SERVICING YOUR HONDA ENGINE FUEL FILTER INSPECTION and FUEL TANK CLEANING 1. Check that the engine oil filler cap is tightened securely. 2. Remove the fuel tank cap, and drain the fuel into an approved gasoline container by tipping the engine toward the fuel filler neck. Gasoline is highly flammable and explosive. You can be burned or seriously injured when handling fuel. Keep heat, sparks and flame away. Handle fuel only outdoors. Wipe up spills immediately.
01/04/03 12:10:46 31ZM3601_036 SERVICING YOUR HONDA ENGINE 3. Pull the fuel filter out through the fuel filler neck by hooking the black fuel tube with a piece of wire, such as a partly straightened paper clip. 4. Inspect the fuel filter. If the fuel filter is dirty, wash it gently with nonflammable or high flashpoint solvent. If the fuel filter is excessively dirty, replace it. Horizontal type: Vertical type: FUEL FILTER 5.
01/04/03 12:10:57 31ZM3601_037 SERVICING YOUR HONDA ENGINE SPARK ARRESTER SERVICE 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 very hot. Allow the muffler to cool before servicing the spark arrester. Use a brush to remove carbon deposits from the spark arrester 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.
01/04/03 12:11:08 31ZM3601_038 SERVICING YOUR HONDA ENGINE Remove and clean the spark arrester in the following manner, or have it serviced by your Honda dealer, if it becomes fouled excessively. 1. Remove the air cleaner cover (see page 29). 2. Remove the spark plug cap, and then remove the spark plug wire and the ignition switch wire from their retainers on the engine top cover. RETAINERS IGNITION SWITCH WIRE SPARK PLUG WIRE 3.
01/04/03 12:11:17 31ZM3601_039 SERVICING YOUR HONDA ENGINE 4. Remove the two 5 mm bolts from the top cover, and remove the top cover. TOP COVER 5 × 22 mm BOLTS 5. Remove the three 5 mm screws from the muffler cover, and remove the muffler cover. 6. Remove the 4 mm screw from the spark arrester, and remove the spark arrester from the muffler.
01/04/03 12:11:25 31ZM3601_040 SERVICING YOUR HONDA ENGINE 7. Use a brush to remove carbon deposits from the spark arrester 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. SPARK ARRESTER SCREEN 8. Install the spark arrester, muffler cover, top cover, and recoil starter in the reverse order of disassembly. 9. Secure the ignition switch wire and spark plug wire in the retainers on the engine top cover.
01/04/03 12:11:34 31ZM3601_041 HELPFUL TIPS & SUGGESTIONS STORING YOUR ENGINE Storage Preparation Proper storage preparation is essential for keeping your engine troublefree 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 to start easier when you use it again. Cleaning If the engine has been running, allow it to cool for at least half an hour before cleaning.
02/12/17 12:47:00 31ZM3601_042 HELPFUL TIPS & SUGGESTIONS The Distributor’s Limited Warranty does not cover fuel system damage or engine performance problems resulting from neglected storage preparation. You can extend fuel storage life by adding a fuel stabilizer that is formulated for that purpose, or you can avoid fuel deterioration problems by draining the fuel tank and carburetor.
01/04/03 12:11:49 31ZM3601_043 HELPFUL TIPS & SUGGESTIONS DRAINING THE FUEL TANK AND CARBURETOR 1. Remove the fuel tank cap and drain the fuel into an approved gasoline container by tipping the engine toward the fuel filler neck. 2. Press the priming bulb several times until there is no more fuel in the fuel return tube. 3. Tip the engine toward the fuel filler neck again to drain the fuel. Gasoline is highly flammable and explosive. You can be burned or seriously injured when handling fuel.
01/04/03 12:12:00 31ZM3601_044 HELPFUL TIPS & SUGGESTIONS Engine Oil 1. Change the engine oil (see page 26). 2. Remove the spark plug (see page 31). 3. Pour a teaspoon (1−3 cc) of clean engine oil into the cylinder. 4. Pull the starter rope several times to distribute the oil in the cylinder. 5. Reinstall the spark plug. 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.
01/04/03 12:12:04 31ZM3601_045 HELPFUL TIPS & SUGGESTIONS 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.
01/04/03 12:12:17 31ZM3601_046 TAKING CARE OF UNEXPECTED PROBLEMS ENGINE WILL NOT START 1. Check control positions. 2. Check fuel. 3. Remove and inspect spark plug. 4. Take engine to an authorized Honda servicing dealer, or refer to shop manual. 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 Choke open. Ignition switch OFF. (on the equipment) Out of fuel.
01/04/03 12:12:23 31ZM3601_047 TECHNICAL & CONSUMER INFORMATION TECHNICAL INFORMATION Serial Number Location SERIAL NUMBER ENGINE TYPE Record the engine serial number in the space below. You will need this serial number when ordering parts, and when making technical or warranty inquires (see page 56).
01/04/03 12:12:31 31ZM3601_048 TECHNICAL & CONSUMER INFORMATION Remote Control Linkage The throttle control lever is provided with a fitting for cable attachment. Remove the air cleaner cover (see page 29 ) for access to the throttle lever and cable fitting.
02/12/17 12:47:06 31ZM3601_049 TECHNICAL & CONSUMER INFORMATION Carburetor Modification 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.
01/04/03 12:12:49 31ZM3601_050 TECHNICAL & CONSUMER INFORMATION Oxygenated Fuels Some conventional gasolines are being blended with alcohol or an ether compound. These gasolines are collectively referred to as oxygenated fuels. To meet clean air standards, some areas of the United States and Canada use oxygenated fuels to help reduce emissions. If you use an oxygenated fuel, be sure it is unleaded and meets the minimum octane rating requirement.
01/04/03 12:12:59 31ZM3601_051 TECHNICAL & CONSUMER INFORMATION 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.
02/12/17 11:49:00 31ZM3601_052 TECHNICAL & CONSUMER INFORMATION 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.
01/04/03 12:13:25 31ZM3601_053 TECHNICAL & CONSUMER INFORMATION 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.
01/04/03 12:13:43 31ZM3601_054 TECHNICAL & CONSUMER INFORMATION Specifications GX22 Type Length × Width × Height Dry weight Engine type Displacement [Bore × Stroke] Max. output Max. torque Max. rotation with no load Fuel consumption Cooling system Ignition system PTO shaft rotation Horizontal (SA2) Vertical (TA2) 8.3 × 9.9 × 9.8 in 8.3 × 9.1 × 9.8 in (210 × 251 × 249 mm) (210 × 230 × 249 mm) 7.3 lbs (3.3 kg) 4-stroke, overhead valve, single cylinder 1.3 cu-in (22 cm ) [ 1.3 × 1.0 in (33 × 26 mm) ] 1.
02/12/17 11:49:05 31ZM3601_055 TECHNICAL & CONSUMER INFORMATION Wiring Diagram Black Ignition switch on the equipment powered by the engine.
01/04/03 12:13:55 31ZM3601_056 TECHNICAL & CONSUMER INFORMATION CONSUMER INFORMATION Honda Publications These publications will give you additional information for maintaining and repairing your engine. You may order them from your Honda engine dealer. Shop Manual This manual covers complete maintenance and overhaul procedures. It is intended to be used by a skilled technician. Parts Catalog This manual provides complete, illustrated parts lists.
01/04/03 12:14:07 31ZM3601_057 TECHNICAL & CONSUMER INFORMATION Warranty Service Information Servicing dealership personnel are trained professionals. They should be able to answer any question you may have. If you encounter a problem that your dealer does not solve to your satisfaction, please discuss it with the dealership’s management. The Service Manager or General Manager can help. Almost all problems are solved in this way.
01/04/03 12:14:16 31ZM3601_058 QUICK REFERENCE INFORMATION Fuel Type Capacity Engine Oil Type Spark Plug Capacity Type Gap Carburetor Maintenance Idle speed Before each use First 10 hours Subsequent Unleaded gasoline with a pump octane rating of 86 or higher (page 23) GX22: 0.119 U S g a l (0.45 , 0.099 Imp gal) for horizontal types 0.159 U S g a l (0.60 , 0.132 Imp gal) for vertical types GX31: 0.172 U S g a l (0.65 , 0.143 Imp gal) for horizontal types 0.159 U S g a l (0.60 , 0.
GX22･31_cover 03.3.5 11:36 ページ 1 31ZM3613 DIC 157 Owner’s Manual GX22•GX31 31ZM3613 00X31-ZM3-6130 N2eY15000.2003.01 Printed in Japan o2003 Honda Motor Co., Ltd.
