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| Home / Outboard Engines / Suzuki Engines / Suzuki DF15 |
Suzuki DF15 Troubleshooting
The Suzuki DF15 is a 4-stroke 2-cylinder SOHC (overhead cam) gasoline outboard engine with a rated power of 15 hp (11 kW) at 5400-6000 rpm. The engine cylinder bore is 2.28" (58 mm) and piston stroke is 2.24" (57 mm). A 18.4 cubic inches (302 cc) outboard motor has a carburetor fuel system, wet sump lubrication by trochoid pump, starting system with recoil or electric starter, pointless electronic ignition system, manual tilt and tiller handle or remote control steering. The fuel tank capacity is 3.2 gal (12 liters). The propeller is made of aluminum and it has three blades.
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| Engine hard starting or not starting |
Fuel tank is empty - Fill fuel up.
Incorrect fuel grade - Change fuel.
Dirt and debris in fuel system - Remove debris and dirt.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Spark plug is defective - Spark plug need to be replaced.
Dirty fuel filter - Change fuel filter.
Carburetor is not working properly - Inspect and adjust.
Dirty fuel lines - Clean fuel system lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Defective fuel pump - Install new pump or repair it.
Throttle cable is worn or adjusted improperly - Change cable or adjust correctly.
Improper valve clearance - Need to adjust valve clearance.
Valve timing is improper - Set the valve timing correctly.
| Engine starts and stops suddenly |
Spark plug is damaged - Replace spark plug.
Clogged or defective carburetor - Clean or replace carburetor.
Ignition coil is defective - Ignition coil must be replaced.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump malfunction - Replace or rebuild fuel pump.
Choke system malfunction - Check and repair choke system.
Incorrect valve clearance - Check and adjust.
Valve timing is improper - Adjust valve timing as required.
Valve springs are bad or broken - Replace valve springs.
Valves are stuck - Clean the valves.
| Engine runs roughly |
Ignition system failure - Inspect ignition system and change faulty parts.
Fuel pump is damaged or dirty - Check fuel pump and change if required.
Carburetor problems - Carburetor diagnostics required.
Clogged fuel lines - Clean fuel system lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Fuel filter is dirty - Replace or clean fuel filter.
Gaskets are worn - Change gaskets.
Water intake is clogged - Clean and wash as required.
Choke system is damaged - Change choke system components as required.
| Engine keeps overheating |
Engine is overloaded - Load reducing required.
Carburetor fuel mixture is too lean - Use proper settings.
Wrong ignition timing - Ignition timing needs to be set properly.
Damaged thermostat - Thermostat need to be replaced.
Defective water pump - Install new water pump.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard engine is positioned too low or too high - Mount the motor as required.
Engine oil level is low - Add oil to the engine crankcase.
Oil pump failure - Replace oil pump.
Water intake is blocked - Clean and wash as required.
Valve setting is wrong - Set the valves correctly.
| Engine knocking sound or abnormal noise |
Stale fuel - Change fuel.
Engine is under excessive load - Reduce load.
Improperly adjusted low idle speed - Adjust idle speed.
Clogged or defective fuel pump - Clean or replace fuel pump.
Crankshaft or main bearings are worn out - Replace crankshaft or bearings.
Cylinder bore or piston rings are damaged - Replace faulty parts.
| Engine loses power |
Dirty or incorrectly adjusted carburetor - Service or correctly adjust carburetor.
Dirty or defective fuel pump - Inspect fuel pump and change as required.
Ignition system is defective - Inspect ignition system and change faulty parts.
Worn cylinder head gasket - Replace cylinder head gasket.
Powerhead parts are damaged - Replace defective parts.
Stuck or burned valves - Service or change valves.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Motor mounted at incorrect height on transom - Check the outboard motor mounting height.
Incorrect trim angle - Adjust trim angle correctly.
| Excessive fuel consumption |
Carburetor main jet adjustment is improper - Adjust main jet as required.
Spark plug is defective or loose - Tighten or change the spark plug.
Worn sleeve, piston, or rings - Change defective components.
| Excessive engine vibration |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Replace propeller shaft.
Weeds clogs the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose Tighten correctly or replace.
| Starter is not working |
Low battery power - Battery is drained, charge it.
Battery discharges quickly - Service charging system or install new battery.
Battery cables are disconnected or terminals are faulty - Check wire connections and change or service terminals.
Starter motor is damaged - Starter needs to be replaced.
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