Honda GX120 Troubleshooting
| Engine Model: Honda GX120 |
| Engine Type: 4-cycle single-cylinder OHV air-cooled gasoline |
| Total Displacement: 7.2 cu.in (118 cc) |
| Rated Engine Power: 3.5 Hp (2.6 kW) at 3600 rpm |
| Carburetor Type: Horizonal with butterfly valve |
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| Engine difficult to start or doesn't start |
No gasoline in tank - Fill it up.
Improper fuel grade - Change gasoline.
There is air in the fuel system - Bleed the system.
Damaged spark plug wiring connection - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Change spark plug as required.
Fuel filter is clogged - Fuel filter needs changing.
Brake pedal not depressed - Press the brake pedal.
Problems with carburetor adjustment - Adjust as required.
Poor compression - Inspect and replace wear parts.
Worn or improperly adjusted choke cable - Replace cable or adjust correctly.
Cooling fins are blocked - Clean and wash as required.
Ignition system failure - Check ignition and replace faulty components.
Stuck or defective throttle cable - Replace or service the cable.
Dirty air filter element - Service or change air filter.
Fuel pump is faulty or clogged - Clean or install new fuel pump.
| Engine stalls after starting |
Damaged spark plug - Install new spark plug.
Faulty or clogged carburetor - Service or replace carburetor.
Ignition coil is defective - Ignition coil must be replaced.
Broken or bad valve springs - Change valve springs.
Valves are stuck - Valves need to be cleaned.
Engine oil level is low - Check and refill engine oil.
Excessive engine load - Reduce load.
Cooling fins are plugged - Need to wash or clean.
Too lean fuel mixture in carburetor - Adjust carburetor correctly.
Incorrect ignition timing - Ignition timing needs to be set properly.
Improper valve setting - Valves needs to be set correctly.
| Engine knocking sound or abnormal noise |
Stale or low octane fuel - Use correct gasoline.
Engine overload - Load reducing required.
Not enough engine oil - Add oil to the engine crankcase.
Incorrect low idle setting - Need to adjust idle speed.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Main bearings or crankshaft are worn out - Worn parts replacement required.
Valve clearance is incorrect - Need to adjust valve clearance.
Piston rings or cylinder bore are worn - Replace faulty components.
Carburetor is clogged or improperly adjusted - Adjust the carburetor properly or clean it.
Air filter element is clogged - Clean or change air filter.
Fuel pump is clogged or faulty - Service or change fuel pump.
Ignition failure - Inspect ignition system and change failed components.
Cylinder head gasket is worn - Install new head gasket.
Burned or stuck valves - Service or replace valves.
Push rod is damaged or worn - Replace push rod.
Worn cylinder block components - Defective parts need to be replaced.
Clogged oil filter (if equipped) - Change or clean oil filter.
| Engine using too much gasoline |
Choke opening is not full - Replace or adjust choke cable.
Improper carburetor main jet adjustment - Adjust it correctly.
Spark plug is loose or faulty - Spark plug need to be tightened or replaced.
Valves are stuck, burned, or worn - Service or replace valves.
Rings, sleeve, or piston are damaged - Replace faulty components as required.
Excessive valve clearance - Adjust to proper valve clearance.
| Engine oil consumption is too high |
Damaged seals or gaskets - Worn parts need to be replaced.
Valve guides and stems are worn - Valves replacement required.
Piston rings are stuck or broken - Install new piston rings.
Worn piston or cylinder liner - Check piston and liner, change as required.
Breather hose or pipe is plugged - Clean or change.
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