GX22 GX31 ENGINE TYPE SERIAL NUMBER OWNER’S MANUAL 32ZM3602 00X32-ZM3-6020 HONDA EUROPE N.V.(EEC) 1 www.honda-engines-eu.
Thank you for purchasing a Honda engine. This manual covers the operation and maintenance of your engine: GX22 GX31 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.
SAFETY INSTRUCTIONS To ensure safe operation− Honda engine is designed to give safe and dependable service if operated according to instructions. Read and understand the Owner’s Manual before operating the engine. Failure to do so could result in personal injury or equipment damage. Do not start the engine without mounting it on an equipment. It is designed to give safe and dependable service only when it is mounted on an equipment.
Safety Instruction To ensure safe operation− Exhaust gas contains poisonous carbon monoxide. Avoid inhalation of exhaust gases. Never run the engine in a closed garage or confined area. Do not place anything on the engine, as it may create a fire hazard. The vertical type engine is equipped with a spark arrester. For the horizontal type engine, a spark arrester is available as an optional part. It is illegal in some areas to operate an engine without a spark arrester.
PRE-OPERATION CHECK 1. Engine oil level Running the engine with insufficient oil can cause serious engine damage. Be sure to check the engine on a level surface with the engine stopped. 1. Place the engine with the fuel tank side downward and horizontally on a level surface. 2. Remove the oil filler cap and check the oil level: it should reach the top of the oil filler neck. 3. If the level is low, fill to the top of the oil filler neck with the recommended oil.
Use Honda 4-stroke, or an equivalent high detergent, premium quality motor oil certified to meet or exceed U.S. automobile manufacturer’s requirements for service classification SG, SF. Motor oils classified SG, SF will show this designation on the container. SAE 10W-30 is recommended for general, all temperature use. MULTI VISCOSITY Ambient temperature Using nondetergent oil or 2-stroke engine oil could shorten the engine’s service life.
2. Air cleaner Never run the engine without the air cleaner. Rapid engine wear will result. Check cleaner for dirt or obstruction of element (page 18 ).
3. Fuel Use automotive gasoline (Unleaded or lowleaded is preferred to minimize combustion chamber deposits). FOR NEW SOUTH WALES ONLY: Use unleaded fuel only. Never use an oil/gasoline mixture or dirty gasoline. Avoid getting dirt, dust or water in the fuel tank. Gasoline is extremely flammable and is explosive under certain conditions. Refuel in a well-ventilated area with the engine stopped. Do not smoke or allow flames or sparks in the area where the engine is refueled or where gasoline is stored.
GASOLINES CONTAINING ALCOHOL If you decide to use a gasoline containing alcohol (gasohol), be sure it’s octane rating is at least as high as that recommended by Honda. There are two types of ‘‘gasohol’’: one containing ethanol, and the other containing methanol. Do not use gasohol that contains more than 10% ethanol. Do not use gasoline containing methanol (methyl or wood alcohol) that does not also contain cosolvents and corrosion inhibitors for methanol.
4. Retightening bolts and nuts Check for loose bolts and nuts. Tighten the bolts and nuts properly and securely, if necessary.
STARTING THE ENGINE 1. Turn the engine switch to the ON position (on the equipment side). 2. Move the choke lever to the CLOSED position. Do not use the choke if the engine is warm or the air temperature is high. CHOKE LEVER CLOSED CLOSED 3. Press the priming pump several times until a fuel flow in the fuel return tube is visually noticed.
4. Pull the starter grip lightly until resistance is felt, then pull briskly. Do not allow the starter grip to snap back against the engine. Return it gently to prevent damage to the starter. Always pull the starter grip briskly. If not pulled briskly, sparks may fail to jump across the spark plug electrodes, resulting in failure to start the engine.
High altitude operation At high altitude, the standard carburetor air-fuel mixture will be excessively rich. Performance will decrease, and fuel consumption will increase. High altitude performance can be improved by specific modifications to the carburetor. If you always operate the engine at altitudes higher than 1,830 m (6,000 feet) above sea level, have your authorized Honda dealer perform these carburetor modifications.
OPERATION 1. Gradually move the choke lever to the OPEN position. Warm up the engine until it run smoothly. CHOKE LEVER OPEN OPEN 2. Position the throttle control lever for the desired engine speed (on the equipment side).
STOPPING THE ENGINE To stop the engine in an emergency, turn the engine switch to the OFF position (on the equipment side). Under normal conditions, use the following procedure: 1. Position the throttle control lever fully to LOW (on the equipment side). 2. Turn the engine switch to the OFF position (on the equipment side).
MAINTENANCE Shut off the engine before performing any maintenance. To prevent accidental start-up, turn OFF the engine switch and disconnect the spark plug cap. The engine should be serviced by an authorized Honda dealer unless the owner has proper tools and service data and feels mechanically qualified. Use only genuine Honda parts or their equivalent. The use of replacement parts which are not of equivalent quality may damage the engine.
Maintenance Schedule REGULAR SERVICE PERIOD Performed at every indicated month First Each use month or operating hour interval, whichever comes first. Every Every 3 month 6 month or or or 10 Hrs. 25 Hrs. 50 Hrs. Every Every year two years or or 100 Hrs. After each 300 Hrs.
1. Oil change Drain the oil while the engine is still warm to assure rapid and complete draining. 1. Check the fuel filler cap is tightened. 2. Remove the oil filler cap and drain the oil into the oil container by inclining the engine toward the oil filler neck. 3. Refill with the recommended oil (see page 6 ) and check the oil level (see page 5 ). 4. Install the oil filler cap. ENGINE OIL CAPACITY: 0.10 (0.11 US qt , 0.
2. Air cleaner service A dirty air cleaner will restrict air flow to the carburetor. To prevent carburetor malfunction, service the air cleaner regularly. Service more frequently when operating the engine in extremely dusty areas. Never use gasoline or low flash point solvents for cleaning the air cleaner element. A fire or explosion could result. Never run the engine without the air cleaner. Rapid engine wear will result. 1. Move the choke lever to the CLOSED (upwards) position. 2.
3. Spark plug service Recommended spark plug: CR5HSB (NGK) U16FSR-UB (DENSO) Never use a spark plug of incorrect heat range. To ensure proper engine operation, the spark plug must be properly gapped and free of deposits. 1. Remove the spark plug cap and use the proper size spark plug wrench to remove the spark plug. If the engine has been running, the muffler will be very hot. Be careful not to touch the muffler.
2. Visually inspect the spark plug. Discard the spark plug if there is apparent wear, or if the insulator is cracked or chipped. Clean the spark plug with a wire brush if it is to be reused. 3. Measure the plug gap with a feeler gauge. Correct as necessary by bending the side electrode. The gap should be: 0.60−0.70 mm (0.024−0.028 in) 0.60−0.70 mm (0.024−0.028 in) 4. Check that the spark plug washer is in good condition and thread the spark plug in by hand to prevent cross-threading. 5.
4. Spark arrester service (for vertical type engines) If the engine has been running, the muffler will be very hot. Allow it to cool before proceeding. The spark arrester must be serviced every 100 hours to keep it functioning as designed. 1. Remove the one 4 mm screw from the deflector guard to remove the deflector guard from the engine top cover. 2. Remove the one 4 mm screw from the deflector to remove the deflector from the spark arrester.
3. 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. If it is damaged or fouled excessively, have it serviced by your Honda dealer.
5. Fuel filter service Gasoline is extremely flammable and is explosive under certain conditions. Do not smoke or allow flames or sparks in the area. 1. Check the engine oil filler cap is tightened securely. 2. Remove the fuel filler cap and drain the fuel into the container by inclining the engine toward the fuel filler neck. FUEL FILLER NECK ENGINE OIL FILLER CAP 3. Pull out the fuel filter with the mechanic’s wire from the fuel filler neck gently. 4. Check the fuel filter of its dirt.
6. Fuel tank cleaning Gasoline is extremely flammable and is explosive under certain conditions. Do not smoke or allow flames or sparks in the area. 1. Check the engine oil filler cap is tightened securely. 2. Remove the fuel filler cap and drain the fuel into the container by inclining the engine toward the fuel filler neck. FUEL FILLER NECK ENGINE OIL FILLER CAP 3. Pull out the fuel filter with the mechanic’s wire from the fuel filler neck gently. 4.
7. Cooling fin service Inspect the cooling fin visually through the cover. If there are dry grass, leaves and mud clogged, contact the Honda power equipment dealer for cleaning it.
TRANSPORTING/STORAGE When transporting the engine, tighten the fuel filler cap to prevent fuel spillage. Fuel vapor or spilled fuel may ignite. Before storing the unit for an extended period; 1. Be sure the storage area is free of excessive humidity and dust. 2. Drain the fuel... Gasoline is extremely flammable and is explosive under certain conditions. Do not smoke or allow flames or sparks in the area. a. Check the engine oil filler cap is tightened securely. b.
3. Change the engine oil (page 17 ). 4. Clean the air cleaner (page 18 ). 5. Remove the spark plug and pour about a tablespoon of clean engine oil into the cylinder. 6. Crank the engine several revolutions to distribute the oil, then reinstall the spark plug. Pull the starter rope slowly until resistance is felt. 7. Cover the engine to keep out dust.
TROUBLESHOOTING When the engine will not start: 1. Is the engine switch in the ON position (on the equipment side)? 2. Is there fuel in the fuel tank? 3. Is gasoline reaching the carburetor? To check, press the priming pump several times. 4. Is there a spark at the spark plug? a. Remove the spark plug cap. Clean any dirt from around the spark plug base, then remove the spark plug. b. Install the spark plug in the plug cap. c. Turn the engine switch ON (on the equipment side). d.
SPECIFICATIONS Dimensions Model Type Power equipment description code Length Width Height Dry weight Engine Engine type Displacement Bore×Stroke Max. output Max. torque Max. rotation with no load Fuel consumption Cooling system Ignition system PTO shaft rotation GX22 Horizontal Vertical GCAF GX31 Horizontal Vertical GCAG 210 mm (8.3 in) 251 mm 230 mm 251 mm 230 mm (9.9 in) (9.1 in) (9.9 in) (9.1 in) 249 mm (9.8 in) 250 mm (9.8 in) 3.3 kg (7.3 lbs) 3.4 kg (7.
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