Honda GX670 Troubleshooting
| Engine Model: Honda GX670 |
| Engine Type: 4-cycle V-twin cylinder OHV air-cooled gasoline |
| Total Displacement: 40.9 cu.in (670 cc) |
| Rated Engine Power: 24 Hp (17.7 kW) at 3600 rpm |
| Carburetor Type: Two-barrels with butterfly valve |
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| Engine is not starting or hard starting |
No gasoline in tank - Fill fuel up.
Incorrect fuel grade - Use correct gasoline grade.
Dirty fuel system - Check and clean.
Defective wiring connection of spark plug - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Replace spark plug.
Plugged fuel filter - Replace fuel filter.
Brake pedal not depressed - Press the brake pedal.
Carburetor is not working properly - Inspect and adjust.
Engine has low compression - Check cylinder block and replace defective parts.
Damaged or incorrectly adjusted choke cable - Adjust properly or change the cable.
Cooling fins are plugged - Clean and wash as required.
Ignition system problems - Check ignition and replace faulty components.
Stuck or faulty throttle cable - Clean or replace the cable.
Clogged air filter - Change or service air filter.
Fuel pump is clogged or faulty - Clean or replace fuel pump.
| Engine starts and stalls suddenly |
Damaged spark plug - Replace spark plug.
Clogged or faulty carburetor - Replace or service carburetor.
Ignition coil is defective - Install a new ignition coil.
Valve springs are loose or broken - Replace valve springs.
Stuck valves - Valves need to be cleaned.
Insufficient engine oil - Add oil to the engine crankcase.
Engine is running overloaded - Reduce engine load.
Cooling fins are plugged - Need to clean or wash.
Carburetor mixture is too lean - Set the carburetor correctly.
Bad ignition timing - Adjust ignition timing as required.
Improper valve setting - Valves needs to be set correctly.
| Abnormal engine knocking or noise |
Low octane gasoline - Use correct gasoline.
Excessive engine load - Load reducing is recommended.
Engine oil level low - Checking oil level and add if necessary.
Too low idle RPM - Test and adjust.
Fuel pump is dirty or defective - Check fuel pump and replace if necessary.
Main bearings or crankshaft wear - Repair or replace defective parts.
Valve clearance is improper - Adjust valve clearance.
Cylinder bore or piston rings are worn - Replace faulty parts.
Carburetor is dirty or improperly adjusted - Service or correctly adjust carburetor.
Air filter element is plugged - Service or change air filter.
Fuel pump is defective or dirty - Inspect fuel pump and change as required.
Defective ignition - Inspect ignition system and change failed components.
Worn cylinder head gasket - Replace the gasket as required.
Burned or stuck valves - Replace or service valves.
Push rod is damaged or worn - Push rod should be replaced.
Cylinder block components are worn - Replace defective components.
Oil filter is dirty (if equipped) - Service or replace oil filter.
| Engine using too much gasoline |
Choke doesn't open well - Adjust or replace choke cable.
Carburetor main jet is improperly adjusted - Adjust main jet as required.
Spark plug is defective or loose - Tighten or replace spark plug.
Stuck, burned, or worn valves - Clean or change valves.
Rings, sleeve, or piston are damaged - Change defective components.
Valve clearance is wrong - Adjust valve clearance.
Gaskets or seals can be faulty - Replace worn parts to avoid leaks.
Valve guides and stems are worn - Valves replacement required.
Worn or stuck piston rings - Change the piston rings as required.
Scuffed piston or cylinder liner - Check liner and piston, replace as required.
Breather hose or pipe is plugged - Change or clean.
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