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Honda GXV120 Troubleshooting
| Engine Model: Honda GXV120 |
| Engine Type: 4-cycle overhead valve 1-cylinder air-cooled gasoline engine |
| Total Displacement: 7.2 cu.in (118 cc) |
| Rated Engine Power: 4 Hp (2.9 kW) at 3600 rpm |
| Fuel System: Horizontal carburetor with butterfly valve |
| Engine won't start or hard to start |
Empty gas tank - Add gasoline.
Incorrect fuel grade - Use correct gasoline grade.
Dirty fuel lines - Inspect and clean.
Spark plug wire connection are damaged - Check spark plug wiring connection, repair or change.
Damaged spark plug - Spark plug need to be replaced.
Clogged fuel filter - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor is dirty - Wash, clean and adjust.
Bad engine compression - Inspect cylinder block and replace worn components.
Worn or unadjusted choke cable - Replace cable or adjust properly.
Cooling fins are plugged - Wash or clean as required.
Ignition system problems - Test ignition and replace failed parts.
Throttle cable is faulty or stuck - Replace or clean the cable.
Dirty air filter element - Replace or service air filter.
Fuel pump is dirty or defective - Clean or replace fuel pump.
| Engine starts but stops suddenly |
Defective spark plug - Spark plug need to be replaced.
Carburetor is dirty or faulty - Service or replace carburetor.
Ignition coil is defective - Replace ignition coil as necessary.
Valve springs are weak or broken - New valve springs need to be installed.
Stuck valves - Clean the valves.
Not enough engine oil - Check and refill engine oil.
Engine is under excessive load - Load reducing required.
Cooling fins are clogged - Need to wash or clean.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Improper ignition timing - Adjust ignition timing correctly.
Incorrect valve setting - Valves needs to be adjusted properly.
| Abnormal engine noise or knocking |
Stale gasoline - Change fuel.
Excessive engine load - Reduce engine load.
Lack of engine oil - Check and refill engine oil.
Too low idle RPM - Adjust as required.
Fuel pump is defective or dirty - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Have bearings or crankshaft replaced.
Valve clearance is not correct - Check and adjust.
Cylinder bore or piston rings are worn - Replace defective parts.
Clogged or incorrectly adjusted carburetor - Adjust carburetor properly or service it.
Air filter is blocked - Change or clean air filter.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Ignition failure - Inspect ignition system and change failed components.
Cylinder head gasket is defective - Replace the gasket as required.
Stuck or burned valves - Replace or service valves.
Worn or defective push rod - Replace push rod.
Faulty cylinder block parts - Replace defective parts as required.
Oil filter is dirty (if equipped) - Change or clean oil filter.
| Excessive fuel consumption |
Choke opening is not full - Replace or adjust choke cable.
Incorrect carburetor main jet adjustment - Adjust main jet as required.
Faulty or loose spark plug - Spark plug need to be tightened or replaced.
Valves are worn, burned or stuck - Replace or clean valves.
Sleeve, rings, or piston are damaged - Change faulty components.
Valve clearance is improper - Adjustment procedure required.
Gaskets or seals may be damaged - Install new components.
Valve guides or stems are damaged - Valves replacement required.
Stuck or worn piston rings - Piston rings need to be replaced.
Damaged cylinder liner or piston - Inspect piston and liner, fit new components as necessary.
Blocked breather pipe or hose - Change or service.
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