Kohler CH620 Troubleshooting
| Engine Model: Kohler Command Pro CH620 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 19 Hp (14.2 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine doesn't start or starts hard |
No gasoline in tank - Fill gasoline up.
Low-quality gasoline - Use correct fuel grade.
Dirty fuel lines - Inspect and clean.
Spark plug wiring connection is defective - Check spark plug wiring connection, repair or change.
Spark plug is defective - Change spark plug.
Plugged fuel filter - Change fuel filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor problems - Carburetor diagnostics required.
Bad compression - Check and change damaged parts.
Damaged or not adjusted choke cable - Replace cable or adjust properly.
Air intake grill is clogged - Wash or clean as required.
Ignition system is defective - Inspect ignition system and change failed components.
Defective or stuck choke cable - Change or clean the cable.
Plugged air filter - Service or change air filter.
Fuel pump is dirty or defective - Check fuel pump and change if required.
| Engine starts but stalls suddenly |
Damaged spark plug - Change spark plug.
Faulty or clogged carburetor - Clean or replace carburetor.
Ignition coil is faulty - Ignition coil must be replaced.
Loose or worn valve springs - Replace valve springs.
Valves sticking - Service the valves.
Lack of engine oil - Add oil to the engine crankcase.
Engine is under excessive load - Reduce engine load.
Cooling fins are plugged - Need to wash or clean.
Carburetor fuel mixture is too lean - Set the carburetor correctly.
Ignition timing is incorrect - Set the ignition timing properly.
Valve setting is wrong - Valves needs to be set correctly.
Stale or low octane fuel - Change fuel.
Engine is overloaded - Load reducing required.
Insufficient engine oil - Checking oil level and add if necessary.
Incorrect low idle setting - Adjust idle speed.
Fuel pump is damaged or dirty - Clean or change fuel pump.
Worn main bearings or crankshaft - Have bearings or crankshaft replaced.
Valve clearance is incorrect - Need to adjust valve clearance.
Cylinder bore or piston rings are damaged - Replace defective components.
Improperly adjusted or dirty carburetor - Service or properly adjust carburetor.
Air filter is dirty - Replace or clean air filter.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Ignition system is defective - Inspect ignition system and change failed components.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Stuck or burned valves - Service or change valves.
Push rod is damaged or worn - Replace push rod.
Cylinder block components are worn - Change defective parts.
Oil filter element is plugged (if equipped) - Change or service oil filter.
| Engine using too much gasoline |
Insufficient throttle opening - Adjust or replace throttle cable.
Incorrect carburetor main jet adjustment - Adjust it properly.
Spark plug is faulty or loose - Spark plug need to be tightened or replaced.
Valves are stuck, worn, or burned - Service or change valves.
Sleeve, piston, or rings are damaged - Replace defective parts.
Incorrect valve clearance - Adjust valve clearance.
| Excessive oil consumption |
Seals or gaskets are wearing excessively - Replace worn parts to avoid leaks.
Valve stems or guides are damaged - Replace defective valves.
Piston rings are seized or worn - Install new piston rings.
Piston or cylinder liner is scuffed - Inspect piston and liner, change as required.
Breather pipe or hose is plugged - Clean or replace.
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