Kohler CH25 Troubleshooting
| Engine Model: Kohler Command CH25 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44 cu.in (725 cc) |
| Rated Engine Power: 25 Hp (18.5 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine doesn't start or hard to start |
Empty fuel tank - Add fuel.
Wrong fuel grade - Change fuel.
Air in the fuel system - Air bleeding.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Replace spark plug.
Dirty fuel filter - Install new filter.
Defective safety switch - Replace if required.
Carburetor is not working properly - Inspect and adjust.
Bad engine compression - Inspect cylinder block and replace worn components.
Throttle cable is worn or adjusted improperly - Adjust correctly or change the cable.
Plugged cooling fins - Clean and wash as required.
Ignition system is defective - Check ignition system and replace faulty parts.
Stuck or defective throttle cable - Clean or replace the cable.
Clogged air filter - Replace or service air filter.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
| Engine starts and stops immediately |
Defective spark plug - Install new spark plug.
Faulty or dirty carburetor - Clean or replace carburetor.
Defective ignition coil - Ignition coil should be replaced.
Valve springs are bad or broken - New valve springs need to be installed.
Valves sticking - Valves must be cleaned.
Engine oil insufficient - Fill up the oil to required level.
Engine overload - Load reducing is recommended.
Plugged cooling fins - Clean and wash as required.
Carburetor is running lean - Make the correct settings.
Improper ignition timing - Set the ignition timing properly.
Wrong valve setting - Set the valves properly.
Low octane gasoline - Use correct fuel.
Engine is under excessive load - Load reducing required.
Engine oil insufficient - Fill up the engine oil.
Low idle speed adjustment is incorrect - Test and adjust.
Fuel pump is defective or dirty - Service or change fuel pump.
Crankshaft or main bearings wear - Repair or replace defective parts.
Incorrect valve clearance - Adjustment procedure required.
Cylinder bore or piston rings are worn - Change defective components.
Improperly or clogged carburetor - Carburetor needs to be adjusted correctly or cleaned.
Air filter element is clogged - Replace or service air filter.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Defective ignition - Check ignition system and replace faulty parts.
Damaged cylinder-head gasket - Install new head gasket.
Valves are stuck or burned - Service or change valves.
Push rod is worn or bent - Install a new push rod.
Cylinder block components are faulty - Replace defective components.
Oil filter is dirty (if equipped) - Replace or service oil filter.
| Engine using too much gasoline |
Throttle does not open well - Inspect throttle cable and adjust it.
Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Loose or faulty spark plug - Spark plug need to be replaced or tightened.
Worn, stuck, or burned valves - Change or service valves.
Worn rings, piston, or sleeve - Replace defective parts as required.
Valve clearance is improper - Need to adjust valve clearance.
Worn gaskets or seals - Worn parts need to be replaced.
Damaged valve stems or valve guides - Change the valves.
Piston rings are seized or worn - Change the piston rings as required.
Scuffed piston or cylinder liner - Check piston and liner, change as required.
Blocked breather hose or pipe - Service or change.
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