Kohler CV490S Troubleshooting
| Engine Model: Kohler Command CV490S |
| Engine Type: 4-cycle single-cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 29.9 cu.in (490 cc) |
| Rated Engine Power: 17 Hp (12.7 kW) at 3600 rpm |
| Carburetor Type: Float with fixed main jet |
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| Engine won't start or starts hard |
Empty fuel tank - Add fuel.
Wrong fuel grade - Use quality fuel.
There is air in the fuel system - Bleed the system.
Faulty spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Change spark plug.
Fuel filter is plugged - Install new filter.
Brake pedal not pushed down - Push the brake pedal down.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Engine has bad compression - Check cylinder block and change wear parts.
Throttle cable is damaged or adjusted incorrectly - Adjust properly or change the cable.
Cooling fins are plugged - Wash or clean as required.
Ignition failure - Inspect ignition system and change faulty parts.
Throttle cable is stuck or faulty - Change or service the cable.
Air filter is dirty - Service or change air filter.
Dirty or faulty fuel pump - Clean or install new fuel pump.
| Engine starts but stalls suddenly |
Spark plug is defective - Install new spark plug.
Clogged or defective carburetor - Service or repair carburetor.
Damaged ignition coil - Change ignition coil as required.
Valve springs are broken or bad - Replace valve springs.
Stuck valves - Valves need to be cleaned.
Lack of engine oil - Fill up the oil to required level.
Excessive engine load - Reduce engine load.
Plugged cooling fins - Need to clean or wash.
Carburetor fuel mixture is too lean - Set the carburetor properly.
Bad ignition timing - Set the ignition timing correctly.
Wrong valve setting - Valves needs to be set correctly.
Stale gasoline - Use proper gasoline.
Engine overload - Reduce engine load.
Engine oil level low - Fill up the oil to required level.
Low idle speed adjustment is incorrect - Adjust the low idle speed.
Fuel pump is dirty or defective - Test fuel pump and replace if necessary.
Main bearings or crankshaft wear - Change defective components as required.
Valve clearance is improper - Check and adjust.
Worn cylinder bore or piston rings - Change faulty components.
Improperly adjusted or dirty carburetor - Service or properly adjust carburetor.
Dirty air filter element - Service or change air filter.
Dirty or faulty fuel pump - Service or change fuel pump.
Ignition failure - Inspect ignition system and change faulty parts.
Blown cylinder head gasket - Replace the head gasket.
Stuck or burned valves - Clean or replace valves.
Worn or bent push rod - Push rod should be replaced.
Damaged cylinder block parts - Change defective components.
Clogged oil filter (if equipped) - Service or change oil filter.
| Excessive fuel consumption |
Choke is not fully open - Check choke cable and adjust it.
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet properly.
Defective or loose spark plug - Change or re-tighten spark plug.
Burned, worn, or stuck valves - Replace or clean valves.
Sleeve, piston, or rings are damaged - Replace faulty parts as required.
Valve clearance is not correct - Adjust valve clearance according to specifications.
| Engine consuming too much oil |
Damaged gaskets or seals - Install new components.
Damaged valve guides or valve stems - Install new valves.
Stuck or worn piston rings - Install new piston rings.
Cylinder liner or piston is damaged - Check piston and liner, replace as required.
Clogged breather pipe or hose - Service or change.
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