Kohler CH730 Troubleshooting
| Engine Model: Kohler Command CH730 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 44.2 cu.in (725 cc) |
| Rated Engine Power: 23.5 Hp (17.5 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine doesn't start or starts hard |
Empty gas tank - Add gasoline.
Wrong grade of gasoline - Use quality fuel.
Air in the fuel lines - Bleed the fuel lines.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug as required.
Dirty fuel filter - Replace fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor components worn out - Repair or replace parts.
Low compression - Check and replace worn parts.
Damaged or not adjusted choke cable - Change cable or adjust properly.
Air intake grill is clogged - Clean and wash as required.
Ignition failure - Inspect ignition system and change failed components.
Stuck or defective choke cable - Service or replace the cable.
Air filter is blocked - Service or change air filter.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
| Engine starts but then shuts off |
Spark plug is damaged - Change spark plug as required.
Carburetor is defective or dirty - Clean or change carburetor.
Faulty ignition coil - Change ignition coil as required.
Damaged or weak valve springs - Replace valve springs.
Valves sticking - Valves need to be cleaned.
Insufficient engine oil - Fill up the oil to required level.
Excessive engine load - Load reducing is recommended.
Clogged cooling fins - Need to clean or wash.
Carburetor fuel mixture is too lean - Set the carburetor correctly.
Ignition timing is wrong - Adjust ignition timing as required.
Wrong valve setting - Adjust valves as required.
| Abnormal engine knocking or noise |
Stale fuel - Change fuel.
Excessive engine load - Reduce engine load.
Engine oil insufficient - Check oil level and add oil as required.
Incorrectly adjusted low idle speed - Correct idle adjustment.
Fuel pump is clogged or faulty - Clean or install new fuel pump.
Crankshaft or main bearings failure - Have bearings or crankshaft replaced.
Valve clearance is improper - Adjust valve clearance according to specifications.
Piston rings or cylinder bore are worn - Change faulty components.
Clogged or incorrectly adjusted carburetor - Adjust the carburetor properly or clean it.
Air filter element is plugged - Service or change air filter.
Fuel pump is dirty or defective - Clean or replace fuel pump.
Ignition system is defective - Inspect ignition system and change failed components.
Defective cylinder head gasket - Install new head gasket.
Burned or stuck valves - Replace or clean valves.
Push rod is worn or damaged - Replace push rod.
Cylinder block parts are damaged - Change defective components.
Oil filter element is clogged (if equipped) - Clean or change oil filter.
| Excessive fuel consumption |
Throttle does not open well - Inspect throttle cable and adjust it.
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet properly.
Spark plug is loose or defective - Re-tighten or change the spark plug.
Stuck, worn, or burned valves - Clean or change valves.
Piston, sleeve, or rings are damaged - Change faulty components.
Valve clearance is incorrect - Check and adjust.
| Engine consuming too much oil |
Gaskets or seals can be faulty - New components need to be installed.
Valve guides and stems are worn - Replace the valves.
Worn or broken piston rings - Piston rings replacement required.
Cylinder liner or piston is scored - Inspect piston and liner, change as required.
Clogged breather hose or pipe - Clean or change.
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