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| Home / Engines / Kohler Engines / Kohler CH680 |
Kohler Command Pro CH680 Problems
| Engine Model: Kohler Command Pro CH680 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft gasoline engine |
| Total Displacement: 41.1 cu.in (674 cc) |
| Rated Engine Power: 22.5 Hp (16.8 kW) at 3600 rpm |
| Fuel System: One-barrel carburetor with fixed main jet |
| Engine won't start or starts hard |
Empty fuel tank - Add gasoline.
Low-quality gasoline - Use quality fuel.
Dirty fuel system - Check and clean.
Disconnected or loose spark plug wire - Inspect spark plug wiring connection, change or repair.
Spark plug is damaged - Change spark plug as required.
Plugged fuel filter - Fuel filter needs changing.
Brake pedal not depressed - Press the brake pedal.
Carburetor components worn out - Repair or replace parts.
Poor compression - Inspect and replace wear parts.
Throttle cable is adjusted improperly or worn - Adjust properly or change the cable.
| Irregular engine running |
Air intake screen is plugged - Wash or clean as required.
Defective ignition system - Test ignition and replace failed parts.
Choke cable is stuck or faulty - Change or clean the cable.
Dirty air filter element - Clean or replace air filter.
Dirty or faulty fuel pump - Check fuel pump and replace if necessary.
| Engine starts and stalls immediately |
Spark plug is damaged - Change spark plug as required.
Defective or dirty carburetor - Repair or clean carburetor.
Damaged ignition coil - Change ignition coil as required.
Bad or damaged valve springs - Replace valve springs.
Valves sticking - Valves need to be cleaned.
| Engine keeps overheating |
Lack of engine oil - Add oil to the engine crankcase.
Excessive engine load - Load reducing required.
Air intake screen is blocked - Wash or clean as required.
Too lean fuel mixture in carburetor - Use proper settings.
Wrong ignition timing - Adjust ignition timing correctly.
Valve setting is improper - Set the valves correctly.
| Abnormal engine knocking or noise |
Stale gasoline - Use correct fuel.
Engine overload - Load reducing required.
Not enough engine oil - Check and refill engine oil.
Too low idle RPM - Adjust idling as required.
Dirty or defective fuel pump - Clean or replace fuel pump.
Worn crankshaft or main bearings - Change defective components as required.
Valve clearance is not correct - Check and adjust.
Damaged piston rings or cylinder bore - Change defective parts.
| Engine loses power |
Carburetor is dirty or incorrectly adjusted - Adjust the carburetor correctly or clean it.
Plugged air filter - Clean or replace air filter.
Dirty or defective fuel pump - Service or replace fuel pump.
Ignition system is defective - Test ignition and replace failed parts.
Defective cylinder head gasket - Replace cylinder head gasket.
Valves are burned or stuck - Service or change valves.
Damaged or worn push rod - Push rod needs to be changed.
Cylinder block components are faulty - Replace defective parts.
Dirty oil filter element (if equipped) - Change or clean oil filter.
| Engine using too much gasoline |
Choke is not fully open - Check choke cable and adjust it.
Improper carburetor main jet adjustment - Adjust it correctly.
Defective or loose spark plug - Re-tighten or replace spark plug.
Burned, worn, or stuck valves - Change or service valves.
Sleeve, piston, or rings are damaged - Change defective parts.
Valve clearance is improper - Adjust valve clearance according to specifications.
| Excessive oil consumption |
Gaskets or seals are excessively worn - Worn parts need to be replaced.
Damaged valve guides or valve stems - Change the valves.
Stuck or defective piston rings - Change the piston rings as required.
Scored cylinder liner or piston - Inspect piston and liner, replace as required.
Breather pipe or hose is blocked - Service or replace.
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