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| Home / Engines / Kohler Engines / Kohler CH12.5S |
Kohler Command CH12.5S Problems
| Engine Model: Kohler Command CH12.5S |
| Engine Type: 4-cycle 1-cylinder horizontal shaft air-cooled gasoline engine |
| Total Displacement: 24.3 cu.in (398 cc) |
| Rated Engine Power: 12.5 Hp (9.4 kW) at 3600 rpm |
| Fuel System: Carburetor with adjustable jet or fixed jet |
| Engine starts up hard or doesn't start |
Fuel tank is empty - Add gasoline.
Low-quality gasoline - Use quality gasoline.
There is air in the fuel system - Bleed the system.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Faulty spark plug - Change spark plug.
Fuel filter is clogged - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor is clogged - Clean the carburetor.
Bad compression - Check and change damaged parts.
Incorrectly adjusted or damaged throttle cable - Change cable or adjust correctly.
| Unstable engine running |
Cooling fins are plugged - Need to clean or wash.
Defective ignition - Check ignition system and replace faulty parts.
Defective or stuck choke cable - Replace or service the cable.
Air filter element is clogged - Clean or replace air filter.
Dirty or damaged fuel pump - Check fuel pump and change if required.
| Engine starts and then stalls |
Faulty spark plug - Change spark plug.
Defective or dirty carburetor - Clean or replace carburetor.
Damaged ignition coil - Ignition coil must be replaced.
Damaged or weak valve springs - Replace valve springs.
Valves sticking - Valves must be cleaned.
| Engine overheating |
Insufficient engine oil - Fill the crankcase with engine oil.
Engine overloaded - Load reducing required.
Cooling fins are plugged - Need to clean or wash.
Carburetor is running lean - Adjust carburetor correctly.
Wrong ignition timing - Set the ignition timing properly.
Valve setting is wrong - Valves needs to be set correctly.
| Engine knocks or noises |
Low octane gasoline - Change fuel.
Engine overload - Load reducing is recommended.
Insufficient engine oil - Check oil level and add oil as required.
Too low idle RPM - Adjust as required.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Crankshaft or main bearings are worn out - Change or repair worn components.
Valve clearance is improper - Adjust to proper valve clearance.
Damaged cylinder bore or piston rings - Change faulty parts.
| Engine loses power |
Carburetor is incorrectly adjusted or clogged - Carburetor needs to be adjusted correctly or cleaned.
Dirty air filter element - Change or service air filter.
Dirty or defective fuel pump - Check fuel pump and replace if necessary.
Defective ignition system - Inspect ignition system and change faulty parts.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Burned or stuck valves - Change or service valves.
Push rod is worn or defective - Replace push rod.
Cylinder block parts are faulty - Replace defective parts as required.
Oil filter element is plugged (if equipped) - Clean or change oil filter.
| Excessive fuel consumption |
Choke doesn't open well - Adjust or replace choke cable.
Carburetor main jet adjustment is incorrect - Adjust it correctly.
Spark plug is loose or defective - Re-tighten or change the spark plug.
Worn, stuck, or burned valves - Replace or service valves.
Worn sleeve, rings, or piston - Change faulty parts.
Incorrect valve clearance - Adjust valve clearance.
| High oil consumption |
Gaskets or seals may be damaged - Replace to repair leaks.
Valve guides and stems are worn - Install new valves.
Piston rings are stuck or worn - Piston rings replacement required.
Piston or cylinder liner is scuffed - Inspect piston and liner, replace as required.
Plugged breather pipe or hose - Clean or replace.
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