Honda GXV620 Troubleshooting
| Engine Model: Honda GXV620 |
| Engine Type: 4-cycle V-twin cylinder OHV air-cooled gasoline |
| Total Displacement: 37.5 cu.in (614 cc) |
| Rated Engine Power: 20 Hp (14.9 kW) at 3600 rpm |
| Carburetor Type: Horizontal with butterfly valve |
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| Engine starts hard or won't start |
Fuel tank is empty - Add gasoline.
Wrong grade of gasoline - Use quality fuel.
Air in the fuel system - Air bleeding.
Spark plug wire connection are damaged - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Change spark plug.
Dirty fuel filter - Replace fuel filter.
Defective safety switch - Replace if required.
Carburetor not adjusted - Adjust according to instructions.
Low compression - Check and replace worn parts.
Choke cable is unadjusted or damaged - Replace cable or adjust correctly.
Clogged cooling fins - Need to clean or wash.
Defective ignition - Inspect ignition system and change faulty parts.
Throttle cable is faulty or stuck - Change or service the cable.
Clogged air filter - Change or clean air filter.
Clogged or defective fuel pump - Test fuel pump and change if necessary.
| Engine stops after starting |
Damaged spark plug - Change spark plug.
Defective or clogged carburetor - Service or replace carburetor.
Ignition coil is not working - Ignition coil must be replaced.
Loose or broken valve springs - Replace valve springs.
Valves are stuck - Valves must be cleaned.
Engine oil insufficient - Fill up the oil to required level.
Engine is overloaded - Reduce load.
Cooling fins are clogged - Wash or clean as required.
Carburetor fuel mixture is too lean - Set the carburetor correctly.
Improper ignition timing - Adjust ignition timing correctly.
Wrong valve setting - Valves needs to be set correctly.
Low octane gasoline - Change gasoline.
Engine overload - Reduce the load.
Engine oil level low - Fill the crankcase with engine oil.
Too low idle RPM - Correct idle settings.
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary.
Main bearings or crankshaft failure - Worn parts replacement required.
Incorrect valve clearance - Adjustment procedure required.
Damaged piston rings or cylinder bore - Change faulty parts.
Carburetor is dirty or improperly adjusted - Service or properly adjust carburetor.
Dirty air filter element - Service or replace air filter.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
Ignition system problems - Check ignition and replace faulty components.
Damaged cylinder-head gasket - Install new cylinder head gasket.
Stuck or burned valves - Clean or replace valves.
Worn or damaged push rod - Push rod needs to be changed.
Cylinder block parts are faulty - Replace defective parts as required.
Oil filter is dirty (if equipped) - Clean or replace oil filter.
| Engine using too much gasoline |
Choke is not fully open - Check choke cable and adjust it.
Carburetor main jet adjustment is improper - Adjust it correctly.
Defective or loose spark plug - Re-tighten or change the spark plug.
Worn, stuck, or burned valves - Change or clean valves.
Worn sleeve, rings, or piston - Change defective components.
Valve clearance is incorrect - Need to adjust valve clearance.
| Engine consuming too much oil |
Worn seals or gaskets - Change worn parts according to specifications.
Valve stems or guides are damaged - Replace the valves.
Stuck or worn piston rings - Install new piston rings.
Scored piston or cylinder liner - Check liner and piston, install new components as required.
Blocked breather hose or pipe - Change or service.
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