Kohler CH20 Troubleshooting
| Engine Model: Kohler Command CH20 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 20 Hp (14.8 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine doesn't start or starts hard |
Empty gas tank - Fill fuel up.
Wrong grade of gasoline - Use correct fuel grade.
Fuel system clogged - Repair or replace.
Loose or disconnected spark plug wire - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Change spark plug as required.
Dirty fuel filter - Install new filter.
Faulty safety switch - Change damaged switch.
Problems with carburetor adjustment - Adjust as required.
Low compression - Check and replace worn parts.
Improperly adjusted or worn throttle cable - Adjust properly or replace the cable.
Cooling fins are blocked - Wash or clean as required.
Ignition system malfunction - Inspect ignition system and change failed components.
Choke cable is stuck or faulty - Replace or clean the cable.
Dirty air filter element - Clean or change air filter.
Dirty or defective fuel pump - Check fuel pump and change if required.
| Engine starts and immediately shuts off |
Spark plug is damaged - Change spark plug as required.
Dirty or faulty carburetor - Service or change carburetor.
Ignition coil is defective - Ignition coil must be replaced.
Loose or broken valve springs - Replace valve springs.
Valves sticking - Clean the valves.
Insufficient engine oil - Check oil level and add oil as required.
Excessive engine load - Load reducing is recommended.
Air intake screen is blocked - Wash or clean as required.
Too lean carburetor mixture - Adjust carburetor properly.
Bad ignition timing - Adjust ignition timing correctly.
Valve setting is improper - Valves needs to be set correctly.
Stale or low octane fuel - Use correct gasoline.
Engine overload - Reduce engine load.
Insufficient engine oil - Checking oil level and add if necessary.
Incorrectly set low idle speed - Correct idle settings.
Dirty or faulty fuel pump - Test fuel pump and change if necessary.
Worn crankshaft or main bearings - Install new parts as as required.
Valve clearance is improper - Need to adjust valve clearance.
Worn cylinder bore or piston rings - Change faulty parts.
Dirty or incorrectly adjusted carburetor - Service or correctly adjust carburetor.
Air filter element is clogged - Replace or clean air filter.
Clogged or defective fuel pump - Check fuel pump and change if required.
Defective ignition system - Check ignition system and replace faulty parts.
Cylinder head gasket is worn - Change cylinder head gasket.
Valves are stuck or burned - Service or replace valves.
Push rod is worn or damaged - Push rod should be replaced.
Cylinder block parts are faulty - Replace defective components.
Oil filter element is clogged (if equipped) - Service or change oil filter.
| Engine using too much gasoline |
Insufficient throttle opening - Adjust or replace throttle cable.
Incorrect carburetor main jet adjustment - Adjust it properly.
Spark plug is faulty or loose - Re-tighten or change the spark plug.
Valves are worn, stuck, or burned - Replace or clean valves.
Sleeve, rings, or piston are damaged - Replace faulty components as required.
Valve clearance is not correct - Adjust valve clearance according to specifications.
| Engine consuming too much oil |
Damaged gaskets or seals - Defective components must be replaced.
Worn valve stems and valve guides - Valves must be replaced.
Stuck or defective piston rings - Piston rings replacement required.
Damaged piston or cylinder liner - Inspect liner and piston, change as necessary.
Blocked breather hose or pipe - Change or service.
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