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Kohler KT725 Troubleshooting

Engine Model: Kohler 7000 Series KT725
Engine Type: 4-cycle twin-cylinder air-cooled gasoline engine
Total Displacement: 44.2 (725 cc)
Rated Engine Power: 22.0 Hp (16.4 kW) at 3600 rpm
Carburetor Type: Fixed main jet


Engine difficult to start or doesn't start

No fuel in fuel tank - Fill fuel up.
Incorrect fuel grade - Use quality fuel.
Air in the fuel pipes - Bleed the fuel pipes.
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair.
Faulty spark plug - Change spark plug as required.
Dirty fuel filter - Replace fuel filter.
Safety contact for brake pedal defective - Install new part.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Bad engine compression - Inspect cylinder block and replace worn components.
Damaged or not adjusted choke cable - Change cable or adjust properly.

Engine runs roughly

Air intake screen is plugged - Clean and wash as required.
Defective ignition system - Inspect ignition system and change faulty parts.
Faulty or stuck throttle cable - Change or service the cable.
Air filter element is clogged - Change or clean air filter.
Fuel pump is dirty or defective - Clean or install new fuel pump.

Engine stalls after starting

Spark plug is faulty - Spark plug need to be replaced.
Faulty or dirty carburetor - Carburetor needs to be replaced or cleaned.
Ignition coil is defective - Ignition coil should be replaced.
Damaged or weak valve springs - Valve springs need to be changed.
Valves sticking - Service the valves.

Engine overheated

Low engine oil level - Add oil to the engine crankcase.
Engine overloaded - Reduce the load.
Plugged cooling fins - Need to clean or wash.
Too lean fuel mixture in carburetor - Adjust carburetor properly.
Ignition timing is improper - Set the ignition timing correctly.
Improper valve setting - Set the valves properly.

Engine noises or knocks

Low octane fuel - Use proper fuel.
Engine is under excessive load - Reduce the load.
Insufficient engine oil - Fill the crankcase with engine oil.
Incorrect low idle setting - Correct the settings.
Clogged or defective fuel pump - Service or change fuel pump.
Crankshaft or main bearings wear - Need to install new components.
Excessive valve clearance - Need to adjust valve clearance.
Cylinder bore or piston rings are damaged - Change faulty components.

Engine power is insufficient

Carburetor is improperly adjusted or dirty - Service or correctly adjust carburetor.
Clogged air filter - Clean or replace air filter.
Fuel pump is damaged or dirty - Check fuel pump and replace if necessary.
Ignition failure - Test ignition and replace failed parts.
Worn cylinder head gasket - Replace cylinder head gasket.
Burned or stuck valves - Replace or clean valves.
Push rod is worn or defective - Push rod should be replaced.
Faulty cylinder block parts - Replace defective components as required.
Oil filter is blocked (if equipped) - Service or replace oil filter.

Excessive fuel consumption

Insufficient choke opening - Inspect choke cable and adjust as required.
Improper carburetor main jet adjustment - Adjust it correctly.
Loose or defective spark plug - Re-tighten or replace spark plug.
Valves are worn, stuck, or burned - Service or replace valves.
Worn piston, rings, or sleeve - Change defective parts.
Valve clearance is wrong - Need to adjust valve clearance.

Engine oil consumption is too high

Worn gaskets or seals - Worn parts need to be replaced.
Valve stems and guides are worn - Install new valves.
Worn or broken piston rings - Install new piston rings.
Piston or cylinder liner is damaged - Check piston and liner, install new parts as required.
Breather hose or pipe is plugged - Replace or service.