Kawasaki FH641V Troubleshooting
| Engine Model: Kawasaki FH641V |
| Engine Type: 4-cycle V-Twin cylinder OHV vertical shaft air-cooled gasoline |
| Total Displacement: 41.2 cu.in (675 cc) |
| Rated Engine Power: 21 Hp (15.7 kW) at 3600 rpm |
| Carburetor Type: Two-barrel with fixed main jet |
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| Engine will not start or difficult to start |
Gas tank is empty - Fill fuel up.
Incorrect fuel grade - Use quality gasoline.
There is air in the fuel system - Bleed the system.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug as required.
Dirty fuel filter - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Poor engine compression - Check cylinder block and replace damaged components.
Damaged or incorrectly adjusted choke cable - Adjust correctly or change the cable.
Cooling fins are clogged - Need to wash or clean.
Defective ignition - Check ignition system and replace faulty parts.
Throttle cable is faulty or stuck - Replace or clean the cable.
Plugged air filter - Service or replace air filter.
Clogged or defective fuel pump - Check fuel pump and change if required.
| Engine starts but then stalls |
Faulty spark plug - Change spark plug as required.
Carburetor is defective or dirty - Clean or replace carburetor.
Ignition coil is damaged - Ignition coil must be replaced.
Weak or damaged valve springs - Valve springs need to be changed.
Stuck valves - Clean the valves.
Insufficient engine oil - Fill up the oil to required level.
Excessive engine load - Load reducing required.
Cooling fins are clogged - Wash or clean as required.
Too lean carburetor mixture - Make the correct settings.
Improper ignition timing - Set the ignition timing properly.
Wrong valve setting - Adjust valves correctly.
Low octane fuel - Use correct fuel.
Engine is overloaded - Load reducing required.
Lack of engine oil - Fill up the engine oil.
Incorrectly adjusted low idle speed - Test and adjust.
Dirty or faulty fuel pump - Clean or change fuel pump.
Worn crankshaft or main bearings - Worn parts replacement required.
Valve clearance is improper - Need to adjust valve clearance.
Cylinder bore or piston rings are damaged - Change faulty components.
Clogged or improperly adjusted carburetor - Adjust the carburetor properly or clean it.
Clogged air filter - Clean or replace air filter.
Dirty or defective fuel pump - Test fuel pump and change if necessary.
Ignition system malfunction - Test ignition and replace failed parts.
Damaged cylinder-head gasket - Replace the gasket as required.
Burned or stuck valves - Clean or change valves.
Worn or defective push rod - Replace push rod.
Cylinder block parts are damaged - Defective parts need to be replaced.
Oil filter is blocked (if equipped) - Service or change oil filter.
Choke didn't open fully - Adjust or change choke cable.
Carburetor main jet is incorrectly adjusted - Adjust it correctly.
Spark plug is faulty or loose - Change or re-tighten spark plug.
Valves are worn, burned or stuck - Service or replace valves.
Worn rings, piston, or sleeve - Replace defective parts as required.
Excessive valve clearance - Need to adjust valve clearance.
| Engine oil consumption is too high |
Worn gaskets or seals - Replace defective parts.
Worn valve stems and valve guides - Need to replace the valves.
Piston rings are stuck or broken - Have piston rings replaced.
Scored cylinder liner or piston - Check liner and piston, install new components as required.
Clogged breather pipe or hose - Clean or replace.
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