Kohler CH680 Troubleshooting
| Engine Model: Kohler Command Pro CH680 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 41.1 cu.in (674 cc) |
| Rated Engine Power: 22.5 Hp (16.8 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine hard to start or won't start |
No fuel in fuel tank - Add gasoline.
Wrong grade of gasoline - Use quality fuel.
Clogged fuel system - Remove clogging.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Faulty spark plug - Change spark plug as required.
Fuel filter is clogged - Install new filter.
Defective safety switch - Replace if required.
Carburetor components worn out - Repair or replace parts.
Engine has low compression - Check cylinder block and replace defective parts.
Choke cable is damaged or not adjusted properly - Replace cable or adjust properly.
Cooling fins are blocked - Wash or clean as required.
Ignition system malfunction - Test ignition and replace failed parts.
Faulty or stuck choke cable - Clean or replace the cable.
Clogged air filter - Service or change air filter.
Fuel pump is damaged or dirty - Test fuel pump and change if necessary.
| Engine starts but then stalls |
Faulty spark plug - Change spark plug.
Carburetor is clogged or faulty - Repair or clean carburetor.
Ignition coil is faulty - Ignition coil must be replaced.
Damaged or weak valve springs - Replace valve springs.
Valves are stuck - Clean the valves.
Engine oil insufficient - Checking oil level and add if necessary.
Engine overloaded - Reduce engine load.
Cooling fins are blocked - Wash or clean as required.
Too lean carburetor mixture - Adjust carburetor properly.
Ignition timing is wrong - Adjust ignition timing as required.
Improper valve setting - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Stale gasoline - Change gasoline.
Engine is under excessive load - Reduce engine load.
Not enough engine oil - Need to add engine oil.
Incorrectly adjusted low idle speed - Adjustment required.
Fuel pump is faulty or clogged - Test fuel pump and replace if necessary.
Crankshaft or main bearings failure - Replace crankshaft or bearings.
Valve clearance is incorrect - Need to adjust valve clearance.
Cylinder bore or piston rings are worn - Replace faulty components.
Carburetor is improperly adjusted or dirty - Carburetor needs to be adjusted correctly or cleaned.
Air filter is dirty - Clean or replace air filter.
Fuel pump is clogged or faulty - Inspect fuel pump and change as required.
Defective ignition - Test ignition and replace failed parts.
Blown cylinder head gasket - Replace the head gasket.
Burned or stuck valves - Clean or change valves.
Push rod is worn or bent - Push rod should be replaced.
Cylinder block parts are worn out - Defective parts need to be replaced.
Oil filter element is plugged (if equipped) - Clean or replace oil filter.
| Excessive fuel consumption |
Throttle did not open fully - Replace or adjust throttle cable.
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet properly.
Spark plug is loose or faulty - Tighten or replace spark plug.
Worn, stuck, or burned valves - Service or change valves.
Worn sleeve, rings, or piston - Replace defective parts as required.
Improper valve clearance - Adjust to proper valve clearance.
| Excessive engine oil consumption |
Worn seals or gaskets - Change worn parts according to specifications.
Valve guides and stems are worn - Replace the valves.
Seized or wear piston rings - Replace piston rings.
Cylinder liner or piston is scored - Inspect piston and liner, change as required.
Blocked breather hose or pipe - Change or service.
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