Kohler CH750 Troubleshooting
| Engine Model: Kohler Command CH750 |
| 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 doesn't start or starts hard |
Fuel tank is empty - Add fuel.
Wrong grade of gasoline - Use quality fuel.
Dirty fuel lines - Inspect and clean.
Disconnected or loose spark plug wire - Inspect spark plug wiring connection, change or repair.
Spark plug is defective - Spark plug need to be replaced.
Plugged fuel filter - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor is not adjusted - Check carburetor float adjustment.
Bad compression - Check and change damaged parts.
Throttle cable is adjusted improperly or worn - Change cable or adjust correctly.
Cooling fins are clogged - Need to clean or wash.
Ignition system malfunction - Check ignition and replace faulty components.
Choke cable is stuck or faulty - Change or clean the cable.
Air filter element is clogged - Service or replace air filter.
Fuel pump is clogged or faulty - Service or change fuel pump.
| Engine starts but then stops |
Damaged spark plug - Install new spark plug.
Clogged or faulty carburetor - Carburetor needs to be replaced or cleaned.
Ignition coil is damaged - Install a new ignition coil.
Weak or damaged valve springs - Valve springs need to be changed.
Stuck valves - Valves must be cleaned.
Engine oil level is low - Add oil to the engine crankcase.
Engine is overloaded - Reduce load.
Cooling fins are plugged - Need to clean or wash.
Carburetor is running lean - Use proper settings.
Ignition timing is wrong - Ignition timing needs to be set properly.
Improper valve setting - Valves needs to be set correctly.
| Abnormal engine noise or knocking |
Low octane gasoline - Use proper fuel.
Engine is running overloaded - Load reducing is recommended.
Engine oil level is low - Need to add engine oil.
Too low idle RPM - Test and adjust.
Clogged or damaged fuel pump - Clean or change fuel pump.
Worn crankshaft or main bearings - Have bearings or crankshaft replaced.
Valve clearance is improper - Adjust valve clearance.
Piston rings or cylinder bore are worn - Replace faulty components.
Carburetor is incorrectly adjusted or clogged - Clean or properly adjust carburetor.
Air filter element is plugged - Service or change air filter.
Fuel pump is defective or dirty - Clean or replace fuel pump.
Ignition system problems - Test ignition and replace failed parts.
Damaged cylinder-head gasket - Install new head gasket.
Burned or stuck valves - Service or change valves.
Push rod is worn or damaged - Push rod needs to be changed.
Worn cylinder block parts - Replace defective components.
Dirty oil filter element (if equipped) - Change or clean oil filter.
| Excessive fuel consumption |
Choke is not fully open - Check choke cable and adjust it.
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet correctly.
Loose or defective spark plug - Change or re-tighten spark plug.
Burned, worn, or stuck valves - Change or clean valves.
Rings, sleeve, or piston are damaged - Replace faulty components.
Valve clearance is improper - Need to adjust valve clearance.
Defective seals or gaskets - New components need to be installed.
Valve stems or guides are damaged - Change the valves.
Stuck or worn piston rings - Change piston rings.
Scored piston or cylinder liner - Inspect piston and liner, change as required.
Plugged breather pipe or hose - Clean or replace.
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