Kohler CH750S Troubleshooting
| Engine Model: Kohler Command CH750S |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 46 cu.in (747 cc) |
| Rated Engine Power: 27 Hp (20.1 kW) at 3600 rpm |
| Carburetor Type: Two-barrel with fixed main jet |
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| Engine starts up hard or doesn't start |
Gas tank is empty - Fill fuel up.
Incorrect fuel grade - Use correct gasoline grade.
Air in fuel tank - Bleed fuel tank.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Spark plug is defective - Change spark plug as required.
Fuel filter is clogged - Fuel filter needs to be replaced.
Defective safety switch - Replace if required.
Carburetor is dirty - Wash, clean and adjust.
Poor cylinder compression - Check cylinder block and change worn parts.
Not adjusted or damaged throttle cable - Replace cable or adjust properly.
Plugged cooling fins - Wash or clean as required.
Defective ignition - Inspect ignition system and change faulty parts.
Choke cable is defective or stuck - Service or change the cable.
Plugged air filter - Replace or service air filter.
Fuel pump is damaged or dirty - Clean or install new fuel pump.
| Engine starts and stalls suddenly |
Spark plug is defective - Spark plug need to be replaced.
Carburetor is defective or dirty - Repair or clean carburetor.
Ignition coil is damaged - Ignition coil must be replaced.
Bad or broken valve springs - Replace valve springs.
Valves are stuck - Valves must be cleaned.
Engine oil insufficient - Fill the crankcase with engine oil.
Engine is overloaded - Reduce engine load.
Air intake screen is plugged - Need to wash or clean.
Too lean fuel mixture in carburetor - Set the carburetor correctly.
Improper ignition timing - Ignition timing needs to be adjusted correctly.
Valve setting is wrong - Valves needs to be set correctly.
Stale gasoline - Use correct gasoline.
Engine overload - Reduce load.
Lack of engine oil - Need to add engine oil.
Low idle speed setting is not correct - Adjust as required.
Fuel pump is dirty or defective - Clean or install new fuel pump.
Main bearings or crankshaft failure - Change or repair worn components.
Incorrect valve clearance - Adjustment procedure required.
Cylinder bore or piston rings are damaged - Change defective components.
Carburetor is improperly adjusted or dirty - Clean or properly adjust carburetor.
Dirty air filter element - Change or service air filter.
Fuel pump is faulty or clogged - Check fuel pump and change if required.
Ignition system problems - Inspect ignition system and change failed components.
Defective cylinder head gasket - Replace the head gasket.
Stuck or burned valves - Change or clean valves.
Push rod is worn or defective - Replace push rod.
Cylinder block parts are damaged - Replace defective components as required.
Oil filter is dirty (if equipped) - Service or change oil filter.
Choke doesn't open well - Adjust or replace choke cable.
Carburetor main jet is incorrectly adjusted - Adjust the carburetor main jet correctly.
Loose or faulty spark plug - Spark plug need to be replaced or tightened.
Burned, worn, or stuck valves - Clean or replace valves.
Sleeve, rings, or piston are damaged - Change faulty parts.
Improper valve clearance - Adjust valve clearance.
| Excessive oil consumption |
Damaged seals or gaskets - Replace defective parts.
Valve stems and guides are worn - Valves need to be changed.
Worn or broken piston rings - Piston rings need to be replaced.
Piston or cylinder liner is scuffed - Check liner and piston, change as required.
Clogged breather hose or pipe - Replace or clean.
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