Kohler CH730S Troubleshooting
| Engine Model: Kohler Command CH730S |
| 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 will not start or starts up hard |
Empty gas tank - Fill fuel up.
Wrong grade of gasoline - Use quality gasoline.
Dirt and debris in fuel system - Remove debris and dirt.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Install new spark plug.
Fuel filter is dirty - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Carburetor is clogged - Clean the carburetor.
Low cylinder compression - Check cylinder block and replace worn parts.
Throttle cable is adjusted incorrectly or damaged - Adjust correctly or replace the cable.
Cooling fins are clogged - Clean and wash as required.
Ignition system malfunction - Inspect ignition system and change failed components.
Throttle cable is faulty or stuck - Change or clean the cable.
Dirty air filter element - Service or replace air filter.
Fuel pump is defective or dirty - Check fuel pump and change if required.
| Engine stops after starting |
Spark plug is faulty - Install new spark plug.
Defective or clogged carburetor - Service or change carburetor.
Ignition coil is damaged - Ignition coil must be replaced.
Broken or loose valve springs - Valve springs need to be changed.
Stuck valves - Service the valves.
Insufficient engine oil - Check and refill engine oil.
Engine overload - Reduce the load.
Air intake grill is clogged - Need to clean or wash.
Too lean carburetor mixture - Adjust carburetor properly.
Wrong ignition timing - Ignition timing needs to be adjusted correctly.
Improper valve setting - Adjust valves correctly.
Stale fuel - Use proper fuel.
Engine is overloaded - Reduce engine load.
Low engine oil level - Fill the crankcase with engine oil.
Incorrectly set low idle speed - Correct idle settings.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Crankshaft or main bearings are worn out - Change or repair worn components.
Valve clearance is improper - Adjust valve clearance.
Piston rings or cylinder bore are damaged - Replace faulty components.
Incorrectly adjusted or clogged carburetor - Clean or correctly adjust carburetor.
Air filter is dirty - Service or change air filter.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Defective ignition system - Inspect ignition system and change faulty parts.
Cylinder head gasket is worn - Replace the gasket as required.
Valves are stuck or burned - Change or clean valves.
Push rod is worn or damaged - Change push rod.
Cylinder block components are faulty - Replace defective parts.
Plugged oil filter (if equipped) - Replace or service oil filter.
| Engine uses too much fuel |
Choke is not fully open - Check choke cable and adjust it.
Incorrect adjustment of carburetor main jet - Adjust the carburetor main jet correctly.
Faulty or loose spark plug - Replace or tighten spark plug.
Valves are worn, burned or stuck - Change or clean valves.
Worn piston, rings, or sleeve - Change faulty parts.
Valve clearance is not correct - Check and adjust.
| Engine using too much oil |
Worn gaskets or seals - To repair leaks, replace worn parts.
Valve stems and guides are worn - Replace the valves.
Seized or wear piston rings - Change piston rings.
Cylinder liner or piston is worn - Check piston and liner, install new parts as required.
Breather pipe or hose is blocked - Replace or service.
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