Kohler CH640 Troubleshooting
| Engine Model: Kohler Command Pro CH640 |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 20.5 Hp (15.3 kW) at 3600 rpm |
| Carburetor Type: One-barrel with fixed main jet |
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| Engine starts hard or doesn't start |
Empty gas tank - Fill it up.
Improper fuel grade - Change gasoline.
Air trapped in fuel system - Bleed air.
Loose or disconnected spark plug wire - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Spark plug need to be replaced.
Fuel filter is plugged - Install new filter.
Safety contact for brake pedal defective - Install new part.
Carburetor incorrectly set - Set carb correctly.
Poor engine compression - Check cylinder block and replace damaged components.
Throttle cable is adjusted improperly or worn - Replace cable or adjust correctly.
Cooling fins are clogged - Need to wash or clean.
Ignition system malfunction - Inspect ignition system and change failed components.
Faulty or stuck choke cable - Change or service the cable.
Plugged air filter - Clean or replace air filter.
Dirty or damaged fuel pump - Service or change fuel pump.
| Engine starts but then stalls |
Defective spark plug - Change spark plug as required.
Carburetor is clogged or defective - Service or change carburetor.
Damaged ignition coil - Install a new ignition coil.
Valve springs are broken or bad - Change valve springs.
Valves are stuck - Clean the valves.
Engine oil level is low - Check and refill engine oil.
Engine is running overloaded - Load reducing required.
Cooling fins are plugged - Need to clean or wash.
Carburetor mixture is too lean - Adjust carburetor properly.
Ignition timing is incorrect - Ignition timing needs to be adjusted correctly.
Improper valve setting - Valves needs to be adjusted properly.
| Abnormal engine noise or knocking |
Low octane gasoline - Change gasoline.
Engine overload - Reduce load.
Not enough engine oil - Add oil to the engine crankcase.
Incorrectly set low idle speed - Adjust idling as required.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
Crankshaft or main bearings failure - Replace crankshaft or bearings.
Valve clearance is improper - Check and adjust.
Cylinder bore or piston rings are damaged - Change faulty components.
Carburetor is clogged or incorrectly adjusted - Adjust the carburetor properly or clean it.
Clogged air filter - Clean or replace air filter.
Fuel pump is defective or dirty - Clean or replace fuel pump.
Ignition system malfunction - Test ignition and replace failed parts.
Cylinder head gasket is blown - Change cylinder head gasket.
Valves are burned or stuck - Service or change valves.
Damaged or worn push rod - Push rod should be replaced.
Faulty cylinder block parts - Defective parts need to be replaced.
Oil filter is blocked (if equipped) - Service or replace oil filter.
Throttle did not open fully - Replace or adjust throttle cable.
Carburetor main jet is improperly adjusted - Adjust main jet as required.
Loose or defective spark plug - Spark plug need to be replaced or tightened.
Stuck, burned, or worn valves - Service or change valves.
Sleeve, piston, or rings are damaged - Replace faulty parts.
Valve clearance is incorrect - Adjust to proper valve clearance.
Worn seals or gaskets - Replace to repair leaks.
Valve stems and guides are worn - Need to replace the valves.
Worn or broken piston rings - Replace piston rings.
Scuffed cylinder liner or piston - Check liner and piston, change as required.
Plugged breather hose or pipe - Service or change.
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