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Kohler CV460S Troubleshooting

Engine Model: Kohler Command CV460S
Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine
Total Displacement: 27.9 (460 cc)
Rated Engine Power: 16.0 Hp (11.9 kW) at 3600 rpm
Carburetor Type: Float with fixed main jet


Engine difficult to start or will not start

Empty fuel tank - Fill fuel up.
Wrong grade of gasoline - Change fuel.
Air trapped in fuel system - Bleed air.
Damaged spark plug wiring connection - Inspect the spark plug wire connection, replace or repair.
Spark plug is faulty - Spark plug need to be replaced.
Fuel filter is dirty - Replace fuel filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor is not working properly - Inspect and adjust.
Poor compression - Inspect and replace wear parts.
Damaged or incorrectly adjusted choke cable - Replace cable or adjust correctly.

Engine runs unevenly

Air intake screen is blocked - Need to wash or clean.
Ignition failure - Inspect ignition system and change failed components.
Stuck or faulty choke cable - Replace or service the cable.
Plugged air filter - Service or change air filter.
Fuel pump is defective or dirty - Clean or replace fuel pump.

Engine starts and stops

Spark plug is faulty - Change spark plug.
Faulty or clogged carburetor - Repair or clean carburetor.
Damaged ignition coil - Ignition coil must be replaced.
Bad or damaged valve springs - Install new valve springs.
Valves sticking - Valves must be cleaned.

Engine overheating

Engine oil insufficient - Fill the crankcase with engine oil.
Engine is under excessive load - Load reducing is recommended.
Cooling fins are blocked - Clean and wash as required.
Carburetor is running lean - Adjust carburetor correctly.
Incorrect ignition timing - Set the ignition timing properly.
Valve setting is improper - Set the valves correctly.

Abnormal engine knocking or noise

Low octane fuel - Use correct gasoline.
Engine overload - Load reducing required.
Not enough engine oil - Need to add engine oil.
Too low idle RPM - Need to adjust idle speed.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
Crankshaft or main bearings failure - Change or repair worn components.
Improper valve clearance - Check and adjust.
Worn piston rings or cylinder bore - Replace faulty parts.

Loss of engine power

Carburetor is incorrectly adjusted or dirty - Adjust the carburetor correctly or clean it.
Air filter is blocked - Service or change air filter.
Clogged or damaged fuel pump - Clean or change fuel pump.
Defective ignition system - Inspect ignition system and change faulty parts.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Valves are stuck or burned - Service or change valves.
Push rod is worn or damaged - Install a new push rod.
Faulty cylinder block components - Replace defective parts as required.
Oil filter is dirty (if equipped) - Service or change oil filter.

Engine using too much gasoline

Throttle not fully open - Check throttle cable and adjust as required.
Carburetor main jet adjustment is improper - Adjust it properly.
Spark plug is faulty or loose - Change or re-tighten spark plug.
Stuck, burned, or worn valves - Clean or replace valves.
Piston, sleeve, or rings are damaged - Replace faulty parts.
Valve clearance is incorrect - Need to adjust valve clearance.

Excessive engine oil consumption

Gaskets or seals may be damaged - Change worn parts according to specifications.
Valve guides and stems are worn - Valves replacement required.
Worn or stuck piston rings - Change piston rings.
Worn cylinder liner or piston - Inspect piston and liner, fit new components as necessary.
Blocked breather pipe or hose - Change or clean.