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| Home / Engines / Kohler Engines / Kohler CH20 |
Kohler Command CH20 Problems
| Engine Model: Kohler Command CH20 |
| Engine Type: 4-cycle 2-cylinder horizontal shaft air-cooled gasoline engine |
| Total Displacement: 39.1 cu.in (624 cc) |
| Rated Engine Power: 20 Hp (14.8 kW) at 3600 rpm |
| Fuel System: One-barrel carburetor with fixed main jet |
| Engine will not start or starts up hard |
Empty gas tank - Fill gasoline up.
Improper fuel grade - Use quality fuel.
Dirty fuel system - Check and clean.
Defective spark plug wire connection - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Change spark plug as required.
Plugged fuel filter - Change fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor is not working properly - Inspect and adjust.
Poor cylinder compression - Check cylinder block and change worn parts.
Throttle cable is worn or adjusted improperly - Replace cable or adjust properly.
| Engine runs unevenly |
Cooling fins are clogged - Clean and wash as required.
Ignition system problems - Check ignition and replace faulty components.
Throttle cable is stuck or defective - Change or clean the cable.
Air filter element is clogged - Clean or change air filter.
Fuel pump is dirty or defective - Service or change fuel pump.
| Engine starts but stalls immediately |
Spark plug is defective - Replace spark plug.
Clogged or faulty carburetor - Replace or service carburetor.
Ignition coil is not working - Install a new ignition coil.
Loose or worn valve springs - Install new valve springs.
Valves sticking - Valves need to be cleaned.
| Engine is overheated |
Not enough engine oil - Checking oil level and add if necessary.
Engine is overloaded - Reduce load.
Cooling fins are plugged - Need to wash or clean.
Too lean fuel mixture in carburetor - Adjust carburetor correctly.
Ignition timing is improper - Ignition timing needs to be set properly.
Wrong valve setting - Set the valves properly.
| Abnormal engine knocking or noise |
Stale gasoline - Change fuel.
Engine is running overloaded - Load reducing required.
Insufficient engine oil - Checking oil level and add if necessary.
Incorrect low idle setting - Correct idle adjustment.
Clogged or damaged fuel pump - Service or change fuel pump.
Crankshaft or main bearings are worn out - Replace crankshaft or bearings.
Valve clearance is not correct - Adjust to proper valve clearance.
Damaged piston rings or cylinder bore - Replace defective components.
| Engine loses power |
Carburetor is improperly adjusted or clogged - Adjust the carburetor correctly or clean it.
Dirty air filter element - Service or replace air filter.
Fuel pump is dirty or defective - Service or change fuel pump.
Defective ignition - Check ignition system and replace faulty parts.
Defective cylinder head gasket - Install new head gasket.
Stuck or burned valves - Clean or replace valves.
Bent or worn push rod - Change push rod.
Cylinder block parts are faulty - Change defective parts.
Dirty oil filter element (if equipped) - Change or service oil filter.
| High fuel consumption |
Choke didn't open fully - Adjust or change choke cable.
Incorrect carburetor main jet adjustment - Adjust the carburetor main jet properly.
Faulty or loose spark plug - Change or re-tighten spark plug.
Worn, stuck, or burned valves - Change or clean valves.
Piston, sleeve, or rings are damaged - Replace defective parts as required.
Valve clearance is not correct - Check and adjust.
| Engine oil consumption is too high |
Seals or gaskets are defective - Replace to repair leaks.
Valve guides and stems are worn - Install new valves.
Stuck or defective piston rings - Install new piston rings.
Cylinder liner or piston is scuffed - Inspect piston and liner, change as required.
Blocked breather hose or pipe - Clean or change.
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