Kohler ECH650 Troubleshooting
| Engine Model: Kohler Command Pro ECH650 EFI |
| Engine Type: 4-cycle V-Twin cylinder horizontal shaft air-cooled gasoline |
| Total Displacement: 42.4 cu.in (694 cc) |
| Rated Engine Power: 21 Hp (15.7 kW) at 3600 rpm |
| Fuel System Type: Electronic fuel injection (EFI) |
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| Engine doesn't start or difficult to start |
No gasoline in tank - Fill fuel up.
Wrong grade of gasoline - Use quality gasoline.
Dirt and debris in fuel system - Remove debris and dirt.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Faulty spark plug - Install new spark plug.
Fuel filter is dirty - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Crankshaft position sensor is loose or defective - Replace as required.
Throttle position sensor damaged or incorrectly adjusted - Adjust or replace throttle position sensor.
Low system voltage - Check voltage regulator and replace if required.
Clogged or defective fuel injectors - Test fuel injectors and replace if necessary.
Fuel lines are clogged - Fuel lines must be clean.
Weak cylinder compression - Inspect cylinder block and change worn parts.
Unadjusted or worn throttle cable - Replace cable or adjust correctly.
Cooling fins are plugged - Wash or clean as required.
Ignition system problems - Check ignition system and replace faulty parts.
Defective or stuck choke cable - Replace or service the cable.
Air filter element is clogged - Change or service air filter.
Dirty or damaged fuel pump - Check fuel pump and change if required.
Fuel injectors are defective or dirty - Clean or install new fuel injectors.
Restricted fuel lines - Fuel lines need to be cleaned.
Improper setting or defective throttle position sensor - Replace or adjust throttle position sensor.
| Engine starts but then shuts off |
Spark plug is faulty - Spark plug need to be replaced.
Ignition coil is defective - Ignition coil should be replaced.
Loose or broken valve springs - Change valve springs.
Stuck valves - Valves must be cleaned.
Fuel filter is plugged - Fuel filter needs to be replaced.
Air filter is dirty - Replace or service air filter.
Dirty fuel lines - Clean fuel system lines.
Dirty or damaged fuel injectors - Service or replace fuel injectors.
Governor setting is incorrect - Set governor correctly.
Not enough engine oil - Fill the crankcase with engine oil.
Engine is under excessive load - Load reducing required.
Air intake screen is plugged - Clean and wash as required.
Bad ignition timing - Adjust ignition timing as required.
Valve setting is improper - Valves needs to be adjusted properly.
| Engine knocking sound or abnormal noise |
Stale fuel - Use proper fuel.
Engine is under excessive load - Load reducing is recommended.
Not enough engine oil - Add oil to the engine crankcase.
Incorrectly set low idle speed - Adjust idle speed.
Fuel pump is clogged or faulty - Service or change fuel pump.
Main bearings or crankshaft are worn out - Have bearings or crankshaft replaced.
Improper valve clearance - Adjustment procedure required.
Worn cylinder bore or piston rings - Replace faulty parts.
Clogged air filter - Service or replace air filter.
Dirty or defective fuel pump - Clean or change fuel pump.
Fuel lines are dirty - Service fuel lines.
Governor adjustment is incorrect - Adjust governor correctly.
One fuel injector is defective - Change fuel injector.
Ignition failure - Check ignition and replace faulty components.
Defective cylinder head gasket - Install new cylinder head gasket.
Burned or stuck valves - Replace or service valves.
Push rod is damaged or worn - Install a new push rod.
Faulty cylinder block components - Change defective parts.
Oil filter is blocked - Clean or replace oil filter.
Choke is not fully open - Check choke cable and adjust it.
Fuel injectors are faulty or clogged - Clean or replace fuel injectors.
Loose or defective spark plug - Tighten or replace spark plug.
Valves are worn, stuck, or burned - Change or service valves.
Worn rings, piston, or sleeve - Replace faulty parts.
Excessive valve clearance - Need to adjust valve clearance.
| Engine using too much oil |
Damaged seals or gaskets - New components need to be installed.
Damaged valve guides or valve stems - Need to replace the valves.
Piston rings are defective or worn - Piston rings need to be replaced.
Scored cylinder liner or piston - Inspect liner and piston, fit new parts as necessary.
Breather hose or pipe is clogged - Replace or clean.
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