Kawasaki FH721V Troubleshooting
| Engine Model: Kawasaki FH721V |
| Engine Type: 4-cycle V-Twin cylinder OHV vertical shaft air-cooled gasoline |
| Total Displacement: 41.2 cu.in (675 cc) |
| Rated Engine Power: 25.3 Hp (18.6 kW) at 3600 rpm |
| Carburetor Type: Two-barrel with fixed main jet |
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| Engine hard starting or not starting |
No gasoline in tank - Add gasoline.
Low-quality gasoline - Use correct gasoline grade.
Air in the fuel lines - Bleed the fuel lines.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Spark plug is defective - Change spark plug as required.
Fuel filter is dirty - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor not adjusted - Adjust according to instructions.
Bad engine compression - Inspect cylinder block and replace worn components.
Choke cable is unadjusted or damaged - Change cable or adjust correctly.
Cooling fins are clogged - Need to clean or wash.
Ignition system failure - Check ignition system and replace faulty parts.
Stuck or defective choke cable - Service or replace the cable.
Plugged air filter - Change or clean air filter.
Clogged or damaged fuel pump - Service or change fuel pump.
| Engine starts but immediately shuts off |
Spark plug is defective - Install new spark plug.
Carburetor is clogged or faulty - Service or repair carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Broken or bad valve springs - New valve springs need to be installed.
Valves sticking - Clean the valves.
Insufficient engine oil - Check oil level and add oil as required.
Engine is overloaded - Reduce load.
Clogged cooling fins - Need to wash or clean.
Too lean carburetor mixture - Use proper settings.
Wrong ignition timing - Set the ignition timing correctly.
Incorrect valve setting - Adjust valves as required.
Stale gasoline - Change fuel.
Engine is overloaded - Load reducing required.
Engine oil level is low - Need to add engine oil.
Incorrect low idle setting - Adjust the low idle speed.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
Crankshaft or main bearings wear - Worn parts replacement required.
Valve clearance is wrong - Adjust to proper valve clearance.
Worn piston rings or cylinder bore - Change faulty parts.
Carburetor is incorrectly adjusted or clogged - Clean or correctly adjust carburetor.
Air filter is dirty - Replace or clean air filter.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Defective ignition system - Check ignition and replace faulty components.
Cylinder head gasket is damaged - Replace the gasket as required.
Burned or stuck valves - Change or service valves.
Push rod is worn or bent - Push rod should be replaced.
Cylinder block components are damaged - Defective parts need to be replaced.
Oil filter is dirty (if equipped) - Replace or clean oil filter.
| Engine uses too much fuel |
Choke is not fully open - Check choke cable and adjust it.
Carburetor main jet adjustment is improper - Adjust the carburetor main jet properly.
Loose or faulty spark plug - Tighten or replace spark plug.
Valves are worn, burned or stuck - Clean or change valves.
Rings, sleeve, or piston are damaged - Change faulty components.
Incorrect valve clearance - Adjust to proper valve clearance.
| Excessive oil consumption |
Gaskets or seals may be damaged - New components need to be installed.
Worn valve stems and valve guides - Change the valves.
Stuck or worn piston rings - Piston rings replacement required.
Cylinder liner or piston is scuffed - Check liner and piston, install new components as required.
Clogged breather pipe or hose - Replace or clean.
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