Kohler CH14S Troubleshooting
| Engine Model: Kohler Command CH14S |
| Engine Type: 4-cycle single-cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 24.3 cu.in (398 cc) |
| Rated Engine Power: 14 Hp (10.5 kW) at 3600 rpm |
| Carburetor Type: Adjustable or fixed main jet |
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| Engine doesn't start or hard to start |
Empty gas tank - Fill it up.
Low-quality gasoline - Use quality gasoline.
Air in the fuel pipes - Bleed the fuel pipes.
Loose or disconnected spark plug wire - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Replace spark plug.
Dirty fuel filter - Install new filter.
Defective safety switch - Replace if required.
Carburetor malfunction - Check and repair as required.
Poor cylinder compression - Check cylinder block and change worn parts.
Choke cable is not adjusted properly or worn - Change cable or adjust properly.
Cooling fins are blocked - Wash or clean as required.
Ignition system problems - Check ignition and replace faulty components.
Defective or stuck throttle cable - Replace or clean the cable.
Air filter element is clogged - Replace or clean air filter.
Dirty or damaged fuel pump - Check fuel pump and change if required.
| Engine starts but stalls suddenly |
Spark plug is damaged - Install new spark plug.
Defective or clogged carburetor - Clean or replace carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Broken or loose valve springs - Valve springs need to be changed.
Valves sticking - Valves must be cleaned.
Insufficient engine oil - Check oil level and add oil as required.
Engine is running overloaded - Reduce engine load.
Air intake screen is plugged - Wash or clean as required.
Carburetor is running lean - Use proper settings.
Incorrect ignition timing - Ignition timing needs to be adjusted correctly.
Valve setting is incorrect - Valves needs to be adjusted properly.
| Abnormal engine noise or knocking |
Stale or low octane fuel - Use correct fuel.
Excessive engine load - Reduce load.
Engine oil level low - Check and refill engine oil.
Too low idle RPM - Correct idle settings.
Clogged or damaged fuel pump - Service or replace fuel pump.
Worn crankshaft or main bearings - Repair or replace defective parts.
Valve clearance is improper - Adjustment procedure required.
Piston rings or cylinder bore are worn - Replace defective parts.
Improperly adjusted or dirty carburetor - Carburetor needs to be adjusted correctly or cleaned.
Dirty air filter element - Clean or change air filter.
Fuel pump is damaged or dirty - Service or change fuel pump.
Defective ignition system - Check ignition and replace faulty components.
Blown cylinder head gasket - Change cylinder head gasket.
Valves are burned or stuck - Service or replace valves.
Push rod is worn or damaged - Replace push rod.
Worn cylinder block parts - Change defective components.
Oil filter element is plugged (if equipped) - Clean or replace oil filter.
| Excessive fuel consumption |
Throttle does not open well - Inspect throttle cable and adjust it.
Incorrect carburetor main jet adjustment - Adjust main jet as required.
Loose or defective spark plug - Spark plug need to be replaced or tightened.
Valves are worn, stuck, or burned - Clean or replace valves.
Piston, sleeve, or rings are damaged - Replace defective components as required.
Excessive valve clearance - Adjust to proper valve clearance.
| Excessive oil consumption |
Defective seals or gaskets - Replace worn parts to avoid leaks.
Damaged valve guides or valve stems - Valves need to be changed.
Damaged or seized piston rings - Piston rings need to be replaced.
Cylinder liner or piston is scored - Inspect liner and piston, replace as necessary.
Clogged breather hose or pipe - Clean or change.
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