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| Home / Engines / Kohler Engines / Kohler CH742 |
Kohler Command PRO CH742 Problems
| Engine Model: Kohler Command PRO CH742 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft gasoline engine |
| Total Displacement: 46 cu.in (747 cc) |
| Rated Engine Power: 25 Hp (18.6 kW) at 3600 rpm |
| Fuel System: Two-barrel carburetor with fixed main jet |
| Engine starts hard or will not start |
Empty gas tank - Fill it up.
Improper fuel grade - Use quality gasoline.
Air in the fuel lines - Bleed the fuel lines.
Spark plug wire connection are damaged - Check spark plug wiring connection, repair or change.
Faulty spark plug - Install new spark plug.
Fuel filter is clogged - Install new filter.
Faulty safety switch - Change damaged switch.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Poor compression - Inspect and replace wear parts.
Throttle cable is adjusted incorrectly or damaged - Change cable or adjust correctly.
| Unstable engine running |
Plugged cooling fins - Need to wash or clean.
Ignition system malfunction - Test ignition and replace failed parts.
Defective or stuck choke cable - Replace or service the cable.
Clogged air filter - Service or replace air filter.
Clogged or defective fuel pump - Service or replace fuel pump.
| Engine starts but stops suddenly |
Faulty spark plug - Replace spark plug.
Defective or dirty carburetor - Service or change carburetor.
Faulty ignition coil - Replace ignition coil as necessary.
Bad or broken valve springs - Install new valve springs.
Stuck valves - Valves need to be cleaned.
| Engine overheats |
Low engine oil level - Fill the crankcase with engine oil.
Engine overload - Load reducing is recommended.
Clogged cooling fins - Wash or clean as required.
Too lean fuel mixture in carburetor - Adjust carburetor correctly.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Improper valve setting - Set the valves properly.
| Abnormal engine noise or knocking |
Low octane gasoline - Use proper fuel.
Excessive engine load - Load reducing required.
Engine oil level low - Need to add engine oil.
Incorrect low idle setting - Adjust as required.
Dirty or damaged fuel pump - Test fuel pump and replace if necessary.
Main bearings or crankshaft wear - Install new parts as as required.
Excessive valve clearance - Adjust valve clearance according to specifications.
Piston rings or cylinder bore are damaged - Change faulty parts.
| Lack of engine power |
Improperly adjusted or dirty carburetor - Service or correctly adjust carburetor.
Clogged air filter - Change or clean air filter.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Ignition system malfunction - Test ignition and replace failed parts.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Valves are stuck or burned - Change or service valves.
Worn or bent push rod - Replace push rod.
Damaged cylinder block parts - Change defective components.
Dirty oil filter element (if equipped) - Service or replace oil filter.
| Engine uses too much fuel |
Throttle did not open fully - Replace or adjust throttle cable.
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet properly.
Spark plug is defective or loose - Re-tighten or replace spark plug.
Valves are stuck, worn, or burned - Service or replace valves.
Piston, sleeve, or rings are damaged - Replace faulty components as required.
Excessive valve clearance - Adjust to proper valve clearance.
| High engine oil consumption |
Damaged seals or gaskets - Replace to repair leaks.
Worn valve guides and valve stems - Install new valves.
Piston rings are stuck or broken - Install new piston rings.
Damaged piston or cylinder liner - Check piston and liner, change as required.
Breather pipe or hose is clogged - Replace or service.
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