Kohler SV620 Troubleshooting
| Engine Model: Kohler Courage SV620 |
| Engine Type: 4-cycle single-cylinder vertical shaft air-cooled gasoline |
| Total Displacement: 36.4 cu.in (597 cc) |
| Rated Engine Power: 22 Hp (16.4 kW) at 3600 rpm |
| Carburetor Type: Fixed main jet |
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| Engine starts hard or doesn't start |
No gasoline in tank - Add fuel.
Low-quality gasoline - Use correct gasoline grade.
Air in the fuel lines - Bleed the fuel lines.
Defective spark plug wire connection - Inspect the spark plug wire connection, replace or repair.
Damaged spark plug - Change spark plug.
Dirty fuel filter - Fuel filter needs changing.
Defective safety switch - Replace if required.
Carburetor components worn out - Repair or replace parts.
Bad compression - Check and change damaged parts.
Throttle cable is adjusted incorrectly or damaged - Adjust correctly or replace the cable.
Cooling fins are clogged - Need to wash or clean.
Ignition failure - Check ignition and replace faulty components.
Choke cable is defective or stuck - Service or replace the cable.
Air filter is blocked - Change or service air filter.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
| Engine starts but immediately shuts off |
Spark plug is faulty - Spark plug need to be replaced.
Defective or dirty carburetor - Replace or service carburetor.
Ignition coil is faulty - Replace ignition coil as necessary.
Valve springs are damaged or weak - New valve springs need to be installed.
Valves are stuck - Valves need to be cleaned.
Insufficient engine oil - Need to add engine oil.
Engine overloaded - Reduce the load.
Cooling fins are plugged - Wash or clean as required.
Carburetor mixture is too lean - Use proper settings.
Incorrect ignition timing - Ignition timing needs to be set properly.
Valve setting is wrong - Set the valves correctly.
Stale fuel - Use correct gasoline.
Engine overload - Reduce load.
Engine oil level low - Fill up the oil to required level.
Too low idle RPM - Correct idle settings.
Clogged or defective fuel pump - Service or change fuel pump.
Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced.
Improper valve clearance - Check and adjust.
Worn cylinder bore or piston rings - Change defective components.
Dirty or improperly adjusted carburetor - Service or correctly adjust carburetor.
Plugged air filter - Service or change air filter.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Ignition system malfunction - Check ignition and replace faulty components.
Defective cylinder head gasket - Install new cylinder head gasket.
Valves are stuck or burned - Clean or replace valves.
Worn or bent push rod - Push rod should be replaced.
Cylinder block components are faulty - Replace defective parts as required.
Oil filter is dirty (if equipped) - Change or service oil filter.
| Engine uses too much fuel |
Choke doesn't open well - Adjust or replace choke cable.
Carburetor main jet adjustment is incorrect - Adjust it properly.
Spark plug is loose or defective - Spark plug need to be tightened or replaced.
Stuck, burned, or worn valves - Replace or service valves.
Sleeve, piston, or rings are damaged - Replace faulty parts.
Valve clearance is not correct - Adjust valve clearance.
| Excessive engine oil consumption |
Gaskets or seals are excessively worn - New components need to be installed.
Valve stems or guides are damaged - Change the valves.
Stuck or worn piston rings - Have piston rings replaced.
Piston or cylinder liner is damaged - Inspect piston and liner, fit new components as necessary.
Plugged breather hose or pipe - Service or replace.
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