Kohler CV12.5S Troubleshooting
| Engine Model: Kohler Command CV12.5S |
| Engine Type: 4-cycle single-cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 24.3 cu.in (398 cc) |
| Rated Engine Power: 12.5 Hp (9.3 kW) at 3600 rpm |
| Carburetor Type: Float with fixed main jet |
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| Engine is not starting or hard starting |
Empty fuel tank - Add fuel.
Incorrect fuel grade - Use correct fuel grade.
Air or water in fuel system - Remove water or air from fuel system.
Faulty spark plug wire connection - Inspect spark plug wiring connection, change or repair.
Faulty spark plug - Spark plug need to be replaced.
Dirty fuel filter - Fuel filter needs changing.
Faulty safety switch - Change damaged switch.
Carburetor is dirty - Wash, clean and adjust.
Engine has bad compression - Check cylinder block and change wear parts.
Incorrectly adjusted or damaged throttle cable - Replace cable or adjust properly.
Air intake screen is plugged - Need to wash or clean.
Ignition system malfunction - Check ignition system and replace faulty parts.
Stuck or defective choke cable - Replace or service the cable.
Air filter element is clogged - Change or clean air filter.
Fuel pump is dirty or defective - Test fuel pump and change if necessary.
| Engine stops after starting |
Faulty spark plug - Change spark plug as required.
Carburetor is clogged or faulty - Clean or change carburetor.
Faulty ignition coil - Change ignition coil as required.
Bad or damaged valve springs - Install new valve springs.
Valves are stuck - Valves need to be cleaned.
Engine oil level is low - Check and refill engine oil.
Excessive engine load - Reduce engine load.
Air intake grill is clogged - Need to clean or wash.
Too lean fuel mixture in carburetor - Set the carburetor correctly.
Improper ignition timing - Adjust ignition timing correctly.
Wrong valve setting - Adjust valves as required.
| Engine knocking sound or abnormal noise |
Low octane gasoline - Use proper fuel.
Excessive engine load - Reduce load.
Engine oil level low - Checking oil level and add if necessary.
Incorrect low idle setting - Adjust idle speed.
Clogged or damaged fuel pump - Service or replace fuel pump.
Worn crankshaft or main bearings - Worn parts replacement required.
Incorrect valve clearance - Check and adjust.
Damaged cylinder bore or piston rings - Change defective components.
Improperly or clogged carburetor - Clean or correctly adjust carburetor.
Air filter element is clogged - Replace or service air filter.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Ignition system malfunction - Check ignition and replace faulty components.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Valves are stuck or burned - Clean or replace valves.
Push rod is worn or damaged - Change push rod.
Cylinder block components are worn - Change defective components.
Oil filter element is plugged (if equipped) - Service or replace oil filter.
Throttle opening is not full - Adjust or change throttle cable.
Carburetor main jet is improperly adjusted - Adjust it properly.
Spark plug is loose or faulty - Tighten or replace spark plug.
Stuck, burned, or worn valves - Service or replace valves.
Worn piston, rings, or sleeve - Change defective parts.
Incorrect valve clearance - Adjust to proper valve clearance.
| Engine consuming too much oil |
Damaged seals or gaskets - To repair leaks, replace worn parts.
Worn valve stems and valve guides - Change the valves.
Stuck or defective piston rings - Change piston rings.
Cylinder liner or piston is worn - Inspect liner and piston, change as necessary.
Breather hose or pipe is clogged - Service or change.
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