Kawasaki FC420V Troubleshooting
| Engine Model: Kawasaki FC420V |
| Engine Type: 4-cycle single-cylinder OHV vertical shaft air-cooled gasoline |
| Total Displacement: 25.8 cu.in (423 cc) |
| Rated Engine Power: 14 Hp (10.4 kW) at 3600 rpm |
| Carburetor Type: Float with fixed main jet |
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| Engine hard to start or doesn't start |
Empty gas tank - Fill it up.
Wrong grade of gasoline - Use quality 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.
Defective spark plug - Replace spark plug.
Dirty fuel filter - Replace fuel filter.
Faulty safety switch - Change damaged switch.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Low engine compression - Inspect cylinder block and change defective components.
Worn or improperly adjusted choke cable - Adjust correctly or replace the cable.
Clogged cooling fins - Need to clean or wash.
Ignition system failure - Check ignition and replace faulty components.
Faulty or stuck choke cable - Replace or clean the cable.
Air filter is dirty - Change or clean air filter.
Dirty or damaged fuel pump - Service or change fuel pump.
| Engine stalls after starting |
Spark plug is defective - Spark plug need to be replaced.
Faulty or dirty carburetor - Replace or service carburetor.
Ignition coil is damaged - Ignition coil should be replaced.
Valve springs are worn or loose - Replace valve springs.
Valves sticking - Service the valves.
Lack of engine oil - Need to add engine oil.
Engine is overloaded - Reduce the load.
Cooling fins are plugged - Need to clean or wash.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Wrong ignition timing - Adjust ignition timing as required.
Improper valve setting - Set the valves correctly.
Stale gasoline - Use correct fuel.
Engine is running overloaded - Reduce load.
Insufficient engine oil - Fill up the oil to required level.
Too low idle RPM - Adjust idling as required.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Main bearings or crankshaft are worn out - Worn parts replacement required.
Valve clearance is incorrect - Adjust to proper valve clearance.
Worn piston rings or cylinder bore - Replace defective components.
Carburetor is improperly adjusted or dirty - Adjust carburetor properly or service it.
Plugged air filter - Change or service air filter.
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary.
Ignition system malfunction - Check ignition system and replace faulty parts.
Blown cylinder head gasket - Cylinder-head gasket replacement required.
Burned or stuck valves - Service or change valves.
Bent or worn push rod - Push rod should be replaced.
Worn cylinder block parts - Replace defective components as required.
Dirty oil filter element (if equipped) - Clean or replace oil filter.
| Engine using too much gasoline |
Throttle did not open fully - Replace or adjust throttle cable.
Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Faulty or loose spark plug - Re-tighten or replace spark plug.
Valves are worn, stuck, or burned - Replace or clean valves.
Worn piston, rings, or sleeve - Replace faulty parts.
Valve clearance is wrong - Need to adjust valve clearance.
Worn gaskets or seals - To repair leaks, replace worn parts.
Worn valve stems and valve guides - Change the valves.
Piston rings are stuck or worn - Piston rings replacement required.
Cylinder liner or piston is scored - Inspect piston and liner, replace as required.
Breather pipe or hose is blocked - Service or change.
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