Kohler CV490 Troubleshooting
| Engine Model: Kohler Command CV490 |
| 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 will not start or hard to start |
Empty gas tank - Add gasoline.
Low-quality gasoline - Change fuel.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Spark plug is damaged - Replace spark plug.
Fuel filter is clogged - Fuel filter needs to be replaced.
Safety contact for brake pedal defective - Install new part.
Carburetor problems - Carburetor diagnostics required.
Low cylinder compression - Check cylinder block and replace worn parts.
Worn or unadjusted choke cable - Change cable or adjust properly.
Plugged cooling fins - Need to clean or wash.
Ignition system malfunction - Check ignition and replace faulty components.
Choke cable is faulty or stuck - Clean or change the cable.
Clogged air filter - Clean or replace air filter.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
| Engine starts but stops suddenly |
Spark plug is damaged - Replace spark plug.
Carburetor is faulty or clogged - Replace or service carburetor.
Ignition coil is defective - Install a new ignition coil.
Broken or loose valve springs - Valve springs need to be changed.
Valves are stuck - Service the valves.
Low engine oil level - Add oil to the engine crankcase.
Engine is running overloaded - Load reducing required.
Air intake screen is plugged - Clean and wash as required.
Carburetor is running lean - Adjust carburetor properly.
Ignition timing is wrong - Adjust ignition timing correctly.
Improper valve setting - Set the valves properly.
| Abnormal engine noise or knocking |
Stale fuel - Change fuel.
Engine overloaded - Reduce the load.
Not enough engine oil - Check and refill engine oil.
Improperly adjusted low idle speed - Adjust idle speed.
Clogged or damaged fuel pump - Clean or change fuel pump.
Worn crankshaft or main bearings - Replace crankshaft or bearings.
Improper valve clearance - Need to adjust valve clearance.
Piston rings or cylinder bore are worn - Change defective parts.
Incorrectly adjusted or dirty carburetor - Adjust the carburetor properly or clean it.
Plugged air filter - Service or replace air filter.
Fuel pump is defective or dirty - Check fuel pump and replace if necessary.
Ignition system malfunction - Check ignition and replace faulty components.
Cylinder head gasket is worn - Install new head gasket.
Valves are stuck or burned - Change or service valves.
Push rod is worn or bent - Change push rod.
Faulty cylinder block parts - Change defective parts.
Oil filter is dirty (if equipped) - Replace or clean oil filter.
Throttle did not open fully - Replace or adjust throttle cable.
Incorrect adjustment of carburetor main jet - Adjust it correctly.
Spark plug is defective or loose - Replace or tighten spark plug.
Valves are stuck, worn, or burned - Replace or service valves.
Worn sleeve, rings, or piston - Change faulty components.
Improper valve clearance - Adjustment procedure required.
| Excessive engine oil consumption |
Worn gaskets or seals - Replace to repair leaks.
Valve stems and guides are worn - Valves replacement required.
Piston rings are stuck or worn - Piston rings need to be replaced.
Piston or cylinder liner is damaged - Inspect liner and piston, fit new parts as necessary.
Breather pipe or hose is blocked - Clean or change.
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