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Kohler Command CH670 Problems
| Engine Model: Kohler Command CH670 |
| Engine Type: 4-cycle twin-cylinder horizontal shaft gasoline engine |
| Total Displacement: 41.1 cu.in (674 cc) |
| Rated Engine Power: 22 Hp (16.4 kW) at 3600 rpm |
| Fuel System: One barrel carburetor with fixed main jet |
| Engine hard starting or not starting |
Fuel tank is empty - Add fuel.
Improper fuel grade - Use correct fuel grade.
Air trapped in fuel system - Bleed air.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Replace spark plug.
Fuel filter is plugged - Fuel filter needs changing.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor settings incorrect - Adjusting as required.
Low cylinder compression - Check cylinder block and replace worn parts.
Incorrectly adjusted or damaged throttle cable - Adjust properly or change the cable.
Plugged cooling fins - Need to clean or wash.
Ignition system malfunction - Check ignition and replace faulty components.
Choke cable is defective or stuck - Replace or service the cable.
Air filter is blocked - Replace or service air filter.
Fuel pump is clogged or faulty - Check fuel pump and change if required.
| Engine starts but immediately stops |
Spark plug is damaged - Install new spark plug.
Faulty or dirty carburetor - Repair or clean carburetor.
Damaged ignition coil - Ignition coil must be replaced.
Valve springs are damaged or weak - Valve springs need to be changed.
Stuck valves - Clean the valves.
Lack of engine oil - Check and refill engine oil.
Engine is under excessive load - Reduce engine load.
Air intake screen is plugged - Clean and wash as required.
Carburetor is running lean - Set the carburetor correctly.
Wrong ignition timing - Adjust ignition timing correctly.
Wrong valve setting - Valves needs to be adjusted properly.
| Engine knocking sound or abnormal noise |
Stale fuel - Use correct fuel.
Engine overloaded - Reduce engine load.
Low engine oil level - Need to add engine oil.
Incorrectly adjusted low idle speed - Adjust the low idle speed.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Crankshaft or main bearings wear - Replace crankshaft or bearings.
Excessive valve clearance - Need to adjust valve clearance.
Cylinder bore or piston rings are worn - Change defective components.
| Engine power is insufficient |
Carburetor is improperly adjusted or dirty - Clean or correctly adjust carburetor.
Air filter element is clogged - Clean or change air filter.
Fuel pump is dirty or defective - Clean or change fuel pump.
Ignition system problems - Inspect ignition system and change failed components.
Cylinder head gasket is worn - Replace the gasket as required.
Stuck or burned valves - Clean or replace valves.
Push rod is bent or worn - Push rod needs to be changed.
Worn cylinder block parts - Replace defective parts.
Oil filter element is clogged (if equipped) - Clean or replace oil filter.
| Excessive fuel consumption |
Throttle opening is not full - Adjust or change throttle cable.
Improper adjustment of carburetor main jet - Adjust it correctly.
Spark plug is defective or loose - Spark plug need to be tightened or replaced.
Valves are worn, burned or stuck - Replace or service valves.
Piston, sleeve, or rings are damaged - Replace faulty parts as required.
Incorrect valve clearance - Need to adjust valve clearance.
| Excessive oil consumption |
Worn seals or gaskets - Install new components.
Damaged valve guides or valve stems - Replace defective valves.
Piston rings are seized or worn - Change the piston rings as required.
Worn cylinder liner or piston - Check piston and liner, install new parts as required.
Plugged breather hose or pipe - Change or service.
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