Honda GXV140 Troubleshooting
| Engine Model: Honda GXV140 |
| Engine Type: 4-cycle 1-cylinder OHV vertical shaft air-cooled gasoline |
| Total Displacement: 8.2 cu.in (135 cc) |
| Rated Engine Power: 5 Hp (3.2 kW) at 3600 rpm |
| Carburetor Type: Horizontal with butterfly valve |
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| Engine difficult to start or doesn't start |
No fuel in fuel tank - Add gasoline.
Wrong grade of gasoline - Use correct gasoline grade.
Dirty fuel lines - Inspect and clean.
Loose or disconnected spark plug wire - Check the spark plug wire connection, repair or replace.
Defective spark plug - Replace spark plug.
Dirty fuel filter - Fuel filter needs changing.
Defective safety switch - Replace if required.
Problems with carburetor adjustment - Adjust as required.
Engine has bad compression - Check cylinder block and change wear parts.
Unadjusted or worn throttle cable - Adjust properly or change the cable.
Clogged cooling fins - Need to clean or wash.
Ignition system is defective - Check ignition and replace faulty components.
Throttle cable is defective or stuck - Change or service the cable.
Clogged air filter - Change or service air filter.
Dirty or damaged fuel pump - Clean or replace fuel pump.
| Engine starts and stalls suddenly |
Defective spark plug - Change spark plug.
Dirty or defective carburetor - Service or change carburetor.
Ignition coil is damaged - Install a new ignition coil.
Weak or damaged valve springs - New valve springs need to be installed.
Valves are stuck - Service the valves.
Insufficient engine oil - Check and refill engine oil.
Engine is running overloaded - Reduce engine load.
Air intake grill is clogged - Need to wash or clean.
Too lean carburetor mixture - Make the correct settings.
Ignition timing is improper - Adjust ignition timing correctly.
Improper valve setting - Adjust valves as required.
Stale or low octane fuel - Use proper fuel.
Excessive engine load - Load reducing required.
Engine oil level low - Fill the crankcase with engine oil.
Too low idle RPM - Correct idle adjustment.
Fuel pump is damaged or dirty - Test fuel pump and replace if necessary.
Worn main bearings or crankshaft - Change or repair worn components.
Valve clearance is incorrect - Adjust valve clearance according to specifications.
Cylinder bore or piston rings are worn - Replace defective components.
| Engine power is insufficient |
Incorrectly adjusted or clogged carburetor - Service or correctly adjust carburetor.
Air filter is blocked - Service or change air filter.
Fuel pump is dirty or defective - Check fuel pump and change if required.
Ignition system malfunction - Test ignition and replace failed parts.
Cylinder head gasket is defective - Replace the head gasket.
Burned or stuck valves - Replace or clean valves.
Push rod is damaged or worn - Push rod should be replaced.
Damaged cylinder block parts - Replace defective parts as required.
Oil filter element is plugged (if equipped) - Clean or change oil filter.
| Engine uses too much fuel |
Throttle opening is not full - Adjust or change throttle cable.
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet correctly.
Spark plug is loose or faulty - Re-tighten or replace spark plug.
Burned, worn, or stuck valves - Service or replace valves.
Sleeve, rings, or piston are damaged - Replace faulty components as required.
Valve clearance is not correct - Need to adjust valve clearance.
| Engine using too much oil |
Worn gaskets or seals - Change worn parts according to specifications.
Valve stems or guides are damaged - Valves replacement required.
Piston rings are seized or worn - Piston rings replacement required.
Piston or cylinder liner is scuffed - Check liner and piston, replace as required.
Blocked breather pipe or hose - Service or change.
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