Kohler CH640S Troubleshooting
| Engine Model: Kohler Command CH640S |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 20.5 Hp (15.3 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine difficult to start or doesn't start |
Gas tank is empty - Fill fuel up.
Incorrect fuel grade - Use correct gasoline grade.
Dirt and debris in fuel system - Remove debris and dirt.
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Install new spark plug.
Fuel filter is clogged - Replace fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor malfunction - Check and repair as required.
Low compression - Check and replace worn parts.
Damaged or incorrectly adjusted choke cable - Adjust correctly or replace the cable.
Air intake screen is plugged - Need to clean or wash.
Ignition system is defective - Test ignition and replace failed parts.
Stuck or faulty choke cable - Clean or change the cable.
Dirty air filter element - Change or service air filter.
Dirty or defective fuel pump - Clean or change fuel pump.
| Engine starts but stalls immediately |
Spark plug is defective - Install new spark plug.
Carburetor is faulty or dirty - Replace or service carburetor.
Ignition coil is damaged - Replace ignition coil as necessary.
Valve springs are bad or broken - Valve springs need to be changed.
Valves are stuck - Valves must be cleaned.
Lack of engine oil - Need to add engine oil.
Excessive engine load - Reduce the load.
Air intake screen is blocked - Need to wash or clean.
Carburetor is running lean - Make the correct settings.
Ignition timing is wrong - Adjust ignition timing as required.
Wrong valve setting - Set the valves correctly.
Stale fuel - Use correct gasoline.
Engine overloaded - Reduce engine load.
Engine oil level low - Fill the crankcase with engine oil.
Too low idle RPM - Adjust the low idle speed.
Dirty or damaged fuel pump - Clean or replace fuel pump.
Main bearings or crankshaft wear - Change defective components as required.
Valve clearance is wrong - Adjust valve clearance.
Damaged piston rings or cylinder bore - Change defective components.
Carburetor is dirty or improperly adjusted - Service or properly adjust carburetor.
Air filter is dirty - Change or service air filter.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Defective ignition - Check ignition and replace faulty components.
Cylinder head gasket is damaged - Install new cylinder head gasket.
Stuck or burned valves - Clean or replace valves.
Worn or defective push rod - Change push rod.
Faulty cylinder block components - Replace defective parts.
Clogged oil filter (if equipped) - Replace or service oil filter.
| Excessive fuel consumption |
Throttle opening is not full - Adjust or change throttle cable.
Carburetor main jet adjustment is incorrect - Adjust it correctly.
Spark plug is defective or loose - Tighten or replace spark plug.
Burned, worn, or stuck valves - Clean or change valves.
Worn sleeve, piston, or rings - Replace defective parts as required.
Valve clearance is improper - Need to adjust valve clearance.
| High engine oil consumption |
Gaskets or seals can be faulty - Defective components must be replaced.
Valve stems or guides are damaged - Valves need to be changed.
Piston rings are stuck or broken - Piston rings need to be replaced.
Cylinder liner or piston is scuffed - Check piston and liner, replace as required.
Breather pipe or hose is clogged - Replace or clean.
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