Kohler CH15S Troubleshooting
| Engine Model: Kohler Command CH15S |
| Engine Type: 4-cycle single-cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 26 cu.in (426 cc) |
| Rated Engine Power: 15 Hp (11.2 kW) at 3600 rpm |
| Carburetor Type: Adjustable or fixed main jet |
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| Engine starts hard or will not start |
No gasoline in tank - Add fuel.
Wrong grade of gasoline - Change gasoline.
Dirt and debris in fuel system - Remove debris and dirt.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Install new spark plug.
Plugged fuel filter - Replace fuel filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor components worn out - Repair or replace parts.
Low engine compression - Inspect cylinder block and change defective components.
Incorrectly adjusted or damaged throttle cable - Replace cable or adjust correctly.
Air intake screen is blocked - Clean and wash as required.
Ignition system problems - Inspect ignition system and change faulty parts.
Faulty or stuck throttle cable - Change or service the cable.
Air filter is blocked - Clean or replace air filter.
Fuel pump is dirty or defective - Test fuel pump and replace if necessary.
| Engine starts but immediately stops |
Faulty spark plug - Change spark plug as required.
Carburetor is clogged or faulty - Clean or change carburetor.
Ignition coil is not working - Ignition coil must be replaced.
Valve springs are broken or bad - Change valve springs.
Stuck valves - Service the valves.
Lack of engine oil - Fill up the engine oil.
Engine overload - Load reducing is recommended.
Air intake grill is clogged - Clean and wash as required.
Too lean carburetor mixture - Make the correct settings.
Ignition timing is improper - Adjust ignition timing as required.
Incorrect valve setting - Adjust valves as required.
Low octane gasoline - Use correct fuel.
Engine is overloaded - Load reducing is recommended.
Lack of engine oil - Fill up the oil to required level.
Low idle speed set incorrectly - Adjust as required.
Dirty or defective fuel pump - Service or replace fuel pump.
Worn crankshaft or main bearings - Install new parts as as required.
Valve clearance is wrong - Adjustment procedure required.
Worn piston rings or cylinder bore - Replace defective parts.
Clogged or incorrectly adjusted carburetor - Clean or properly adjust carburetor.
Air filter is dirty - Replace or clean air filter.
Fuel pump is defective or dirty - Check fuel pump and change if required.
Ignition failure - Inspect ignition system and change failed components.
Cylinder head gasket is blown - Install new head gasket.
Valves are burned or stuck - Replace or clean valves.
Push rod is worn or damaged - Change push rod.
Damaged cylinder block components - Defective components need to be replaced.
Dirty oil filter element (if equipped) - Replace or clean oil filter.
| Engine using too much gasoline |
Throttle opening is not full - Adjust or change throttle cable.
Carburetor main jet is incorrectly adjusted - Adjust the carburetor main jet correctly.
Defective or loose spark plug - Spark plug need to be replaced or tightened.
Valves are worn, stuck, or burned - Service or change valves.
Worn sleeve, rings, or piston - Replace faulty parts as required.
Valve clearance is not correct - Need to adjust valve clearance.
| High engine oil consumption |
Seals or gaskets are wearing excessively - Replace defective parts.
Valve guides or stems are damaged - Install new valves.
Piston rings are stuck or broken - Replace piston rings.
Scored cylinder liner or piston - Check liner and piston, install new components as required.
Plugged breather pipe or hose - Service or change.
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