Kohler CH740 Troubleshooting
| Engine Model: Kohler Command CH740 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44 cu.in (725 cc) |
| Rated Engine Power: 25 Hp (18.6 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine hard starting or not starting |
No fuel in fuel tank - Add gasoline.
Incorrect fuel grade - Change gasoline.
Dirty fuel lines - Inspect and clean.
Loose or disconnected spark plug wire - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Install new spark plug.
Plugged fuel filter - Install new filter.
Safety contact for brake pedal defective - Install new part.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Poor cylinder compression - Check cylinder block and change worn parts.
Throttle cable is worn or adjusted improperly - Adjust properly or change the cable.
Clogged cooling fins - Need to wash or clean.
Defective ignition - Check ignition and replace faulty components.
Throttle cable is stuck or faulty - Change or clean the cable.
Clogged air filter - Clean or change air filter.
Dirty or defective fuel pump - Clean or install new fuel pump.
| Engine starts but then stops |
Defective spark plug - Install new spark plug.
Faulty or dirty carburetor - Service or change carburetor.
Damaged ignition coil - Change ignition coil as required.
Loose or broken valve springs - Valve springs need to be changed.
Valves are stuck - Valves must be cleaned.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Engine overload - Load reducing is recommended.
Cooling fins are plugged - Need to wash or clean.
Carburetor is running lean - Set the carburetor properly.
Improper ignition timing - Set the ignition timing correctly.
Improper valve setting - Adjust valves as required.
| Abnormal engine knocking or noise |
Low octane fuel - Use correct gasoline.
Excessive engine load - Reduce the load.
Engine oil level is insufficient - Check and refill engine oil.
Incorrectly set low idle speed - Adjust as required.
Dirty or faulty fuel pump - Test fuel pump and replace if necessary.
Worn crankshaft or main bearings - Repair or replace defective parts.
Valve clearance is incorrect - Need to adjust valve clearance.
Damaged cylinder bore or piston rings - Replace defective components.
| Engine power is insufficient |
Carburetor is clogged or incorrectly adjusted - Clean or properly adjust carburetor.
Air filter is dirty - Clean or replace air filter.
Clogged or damaged fuel pump - Test fuel pump and replace if necessary.
Ignition system failure - Check ignition system and replace faulty parts.
Blown cylinder head gasket - Replace cylinder head gasket.
Valves are stuck or burned - Service or replace valves.
Worn or damaged push rod - Change push rod.
Cylinder block parts are worn out - Replace defective parts as required.
Dirty oil filter element (if equipped) - Clean or change oil filter.
| Excessive fuel consumption |
Choke did not open fully - Change or adjust choke cable.
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet properly.
Loose or faulty spark plug - Spark plug need to be replaced or tightened.
Stuck, burned, or worn valves - Service or replace valves.
Sleeve, rings, or piston are damaged - Replace defective components as required.
Valve clearance is improper - Adjustment procedure required.
| Engine using too much oil |
Gaskets or seals are excessively worn - Replace worn parts to avoid leaks.
Worn valve stems and valve guides - Replace defective valves.
Piston rings are seized or worn - Install new piston rings.
Cylinder liner or piston is worn - Inspect liner and piston, change as necessary.
Breather hose or pipe is plugged - Clean or replace.
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