Home / Small Engines / Kohler Engines / Kohler CV15S

Kohler CV15S Troubleshooting

Engine Model: Kohler Command CV15S
Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine
Total Displacement: 26 (426 cc)
Rated Engine Power: 15.0 Hp (11.2 kW) at 3600 rpm
Carburetor Type: Float with fixed main jet


Engine starts hard or won't start

Gas tank is empty - Add gasoline.
Incorrect fuel grade - Use correct gasoline grade.
There is air in the fuel system - Bleed the system.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Spark plug is defective - Change spark plug.
Fuel filter is clogged - Install new filter.
Brake pedal not depressed - Press the brake pedal.
Carburetor incorrectly set - Set carb correctly.
Engine has low compression - Check cylinder block and replace defective parts.
Unadjusted or worn throttle cable - Adjust correctly or replace the cable.

Engine runs intermittently

Air intake grill is clogged - Need to wash or clean.
Ignition system is defective - Check ignition and replace faulty components.
Throttle cable is defective or stuck - Replace or clean the cable.
Air filter is blocked - Service or replace air filter.
Dirty or defective fuel pump - Check fuel pump and change if required.

Engine starts and then shuts off

Defective spark plug - Install new spark plug.
Defective or clogged carburetor - Clean or install new carburetor.
Ignition coil is damaged - Replace ignition coil as necessary.
Bad or broken valve springs - New valve springs need to be installed.
Stuck valves - Valves must be cleaned.

Engine is overheated

Lack of engine oil - Check and refill engine oil.
Engine overloaded - Reduce engine load.
Clogged cooling fins - Need to clean or wash.
Too lean carburetor mixture - Set the carburetor correctly.
Ignition timing is incorrect - Adjust ignition timing correctly.
Improper valve setting - Valves needs to be set correctly.

Abnormal engine noise or knocking

Low octane gasoline - Use proper gasoline.
Excessive engine load - Reduce engine load.
Engine oil level is low - Fill up the oil to required level.
Low idle speed setting is incorrect - Adjustment required.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Main bearings or crankshaft are worn out - Worn parts replacement required.
Valve clearance is not correct - Adjustment procedure required.
Worn cylinder bore or piston rings - Change defective components.

Engine power is too low

Clogged or improperly adjusted carburetor - Carburetor needs to be adjusted correctly or cleaned.
Dirty air filter element - Change or service air filter.
Fuel pump is faulty or clogged - Clean or replace fuel pump.
Ignition system failure - Check ignition system and replace faulty parts.
Blown cylinder head gasket - Replace the head gasket.
Valves are stuck or burned - Change or clean valves.
Worn or damaged push rod - Push rod should be replaced.
Cylinder block components are worn - Change defective components.
Dirty oil filter element (if equipped) - Clean or replace oil filter.

Engine using too much gasoline

Throttle opening is not full - Adjust or change throttle cable.
Carburetor main jet is incorrectly adjusted - Adjust the carburetor main jet properly.
Loose or faulty spark plug - Replace or tighten spark plug.
Valves are stuck, burned, or worn - Change or clean valves.
Rings, sleeve, or piston are damaged - Change defective components.
Excessive valve clearance - Adjust to proper valve clearance.

High oil consumption

Seals or gaskets are defective - New components need to be installed.
Damaged valve stems or valve guides - Replace defective valves.
Piston rings are defective or worn - Piston rings need to be replaced.
Cylinder liner or piston is scored - Check piston and liner, replace as required.
Plugged breather pipe or hose - Clean or change.