Honda GX660 Troubleshooting
| Engine Model: Honda GX660 |
| Engine Type: 4-cycle V-twin cylinder OHV air-cooled gasoline |
| Total Displacement: 41.9 cu.in (688 cc) |
| Rated Engine Power: 21.7 Hp (16 kW) at 3600 rpm |
| Carburetor Type: Two-barrels with butterfly valve |
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| Engine starts hard or doesn't start |
No fuel in fuel tank - Fill gasoline up.
Incorrect fuel grade - Change gasoline.
Air in fuel tank - Bleed fuel tank.
Spark plug wire connection are damaged - Check the spark plug wire connection, repair or replace.
Spark plug is defective - Spark plug need to be replaced.
Fuel filter is plugged - Fuel filter needs changing.
Brake pedal not depressed - Press the brake pedal.
Carburetor is not working properly - Inspect and adjust.
Poor engine compression - Check cylinder block and replace damaged components.
Worn or improperly adjusted choke cable - Replace cable or adjust properly.
Cooling fins are clogged - Clean and wash as required.
Defective ignition - Inspect ignition system and change failed components.
Faulty or stuck throttle cable - Clean or change the cable.
Air filter is dirty - Replace or service air filter.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
| Engine starts but then stalls |
Faulty spark plug - Spark plug need to be replaced.
Carburetor is faulty or dirty - Service or repair carburetor.
Ignition coil is faulty - Replace ignition coil as necessary.
Worn or loose valve springs - Change valve springs.
Stuck valves - Valves need to be cleaned.
Low engine oil level - Fill up the engine oil.
Engine is overloaded - Load reducing is recommended.
Air intake grill is clogged - Clean and wash as required.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Ignition timing is improper - Ignition timing needs to be set properly.
Valve setting is wrong - Set the valves properly.
Low octane fuel - Change fuel.
Engine overloaded - Load reducing is recommended.
Insufficient engine oil - Fill up the engine oil.
Low idle speed setting is not correct - Adjust idling as required.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Main bearings or crankshaft failure - Crankshaft or bearings need to be replaced.
Valve clearance is wrong - Adjustment procedure required.
Damaged cylinder bore or piston rings - Change faulty parts.
Dirty or improperly adjusted carburetor - Service or properly adjust carburetor.
Air filter element is clogged - Replace or service air filter.
Fuel pump is damaged or dirty - Test fuel pump and replace if necessary.
Defective ignition system - Test ignition and replace failed parts.
Damaged cylinder-head gasket - Replace the head gasket.
Valves are burned or stuck - Change or service valves.
Damaged or worn push rod - Replace push rod.
Worn cylinder block parts - Change defective parts.
Clogged oil filter (if equipped) - Clean or replace oil filter.
| Engine using too much gasoline |
Insufficient throttle opening - Adjust or replace throttle cable.
Carburetor main jet is incorrectly adjusted - Adjust it properly.
Loose or defective spark plug - Tighten or replace spark plug.
Valves are worn, burned or stuck - Change or service valves.
Worn piston, rings, or sleeve - Change faulty components.
Improper valve clearance - Need to adjust valve clearance.
| High engine oil consumption |
Seals or gaskets are wearing excessively - Change worn parts according to specifications.
Valve guides or stems are damaged - Replace defective valves.
Piston rings are stuck or worn - Piston rings need to be replaced.
Worn cylinder liner or piston - Check piston and liner, install new parts as required.
Breather hose or pipe is blocked - Service or replace.
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