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| Home / Engines / Kohler Engines / Kohler CH620 |
Kohler Command Pro CH620 Problems
| Engine Model: Kohler Command Pro CH620 |
| Engine Type: 4-cycle V-twin cylinder horizontal shaft gasoline engine |
| Total Displacement: 38 cu.in (624 cc) |
| Rated Engine Power: 19 Hp (14.2 kW) at 3600 rpm |
| Fuel System: Single-barrel carburetor with fixed main jet |
| Engine difficult to start or doesn't start |
Empty gas tank - Fill gasoline up.
Low-quality gasoline - Use correct gasoline grade.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wire is disconnected or loose - Check the spark plug wire connection, repair or replace.
Spark plug is faulty - Replace spark plug.
Clogged fuel filter - Fuel filter needs changing.
Safety contact for brake pedal defective - Install new part.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Weak cylinder compression - Inspect cylinder block and change worn parts.
Throttle cable is adjusted improperly or worn - Change cable or adjust properly.
| Engine runs unevenly |
Air intake screen is plugged - Need to wash or clean.
Ignition system failure - Inspect ignition system and change failed components.
Stuck or faulty throttle cable - Replace or service the cable.
Plugged air filter - Service or change air filter.
Clogged or damaged fuel pump - Service or change fuel pump.
| Engine stops after starting |
Spark plug is faulty - Change spark plug.
Faulty or clogged carburetor - Service or change carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Valve springs are broken or bad - Install new valve springs.
Valves sticking - Clean the valves.
| Engine is overheated |
Not enough engine oil - Checking oil level and add if necessary.
Engine overload - Reduce load.
Plugged cooling fins - Need to wash or clean.
Too lean fuel mixture in carburetor - Use proper settings.
Incorrect ignition timing - Ignition timing needs to be set properly.
Incorrect valve setting - Adjust valves as required.
| Engine noises or knocks |
Stale gasoline - Change fuel.
Engine overloaded - Load reducing required.
Engine oil insufficient - Checking oil level and add if necessary.
Low idle speed set incorrectly - Test and adjust.
Fuel pump is dirty or defective - Service or replace fuel pump.
Main bearings or crankshaft wear - Need to install new components.
Valve clearance is improper - Adjust valve clearance.
Damaged cylinder bore or piston rings - Change defective parts.
| Engine power loss |
Dirty or improperly adjusted carburetor - Service or properly adjust carburetor.
Air filter element is plugged - Change or clean air filter.
Dirty or damaged fuel pump - Service or change fuel pump.
Defective ignition system - Inspect ignition system and change failed components.
Blown cylinder head gasket - Replace cylinder head gasket.
Stuck or burned valves - Service or change valves.
Push rod is worn or defective - Replace push rod.
Cylinder block parts are faulty - Replace defective parts.
Oil filter element is clogged (if equipped) - Change or service oil filter.
| Engine using too much gasoline |
Insufficient choke opening - Inspect choke cable and adjust as required.
Incorrect carburetor main jet adjustment - Adjust the carburetor main jet properly.
Loose or faulty spark plug - Replace or tighten spark plug.
Stuck, burned, or worn valves - Change or service valves.
Worn sleeve, piston, or rings - Change defective components.
Valve clearance is incorrect - Need to adjust valve clearance.
| Excessive oil consumption |
Seals or gaskets are defective - Install new components.
Valve guides or stems are damaged - Install new valves.
Piston rings are stuck or broken - Piston rings need to be replaced.
Piston or cylinder liner is scuffed - Check liner and piston, change as required.
Plugged breather hose or pipe - Replace or service.
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