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| Home / Outboard Engines / Suzuki Engines / Suzuki DF6AS |
Suzuki DF6AS Troubleshooting
The Suzuki DF6AS is a 4-stroke 1-cylinder OHV (overhead valve) gasoline short shaft outboard engine with a rated power of 6 hp (4.4 kW) at 4750-5750 rpm. The engine cylinder bore is 2.38" (60.4 mm) and piston stroke is 1.89" (48 mm). A 8.42 cubic inches (138 cc) outboard motor has a lubrication with trochoid pump, carburetor fuel system, mechanical fuel pump type, starting system with manual start, digital capacitor discharge ignition system, manual tilt and tiller handle steering. The fuel tank capacity is 0.3 gal (1 liters). The propeller is made of aluminum and it has three blades.
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| Engine won't start or starts hard |
Empty gas tank - Fill gasoline up.
Wrong grade of gasoline - Change fuel.
Air trapped in fuel system - Bleed air.
Spark plug wire connection are damaged - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug as required.
Fuel filter is plugged - Fuel filter needs changing.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Fuel lines are dirty - Clean fuel system lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump defective - Repair or change fuel pump.
Throttle cable is adjusted improperly or worn - Adjust properly or replace the cable.
Improper valve clearance - Adjust to proper valve clearance.
Valve timing is wrong - Set the valve timing properly.
| Engine starts and stops suddenly |
Spark plug is faulty - Change spark plug as required.
Clogged or faulty carburetor - Service or replace carburetor.
Ignition coil is not working - Change ignition coil as required.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Fuel pump is faulty - Replace or repair fuel pump.
Choke system is damaged - Check and repair choke system.
Improper valve clearance - Adjust valve clearance.
Valve timing is incorrect - Adjust valve timing correctly.
Broken or bad valve springs - New valve springs need to be installed.
Valves are stuck - Clean the valves.
| Engine runs roughly |
Ignition system problems - Inspect ignition system and change failed components.
Fuel pump is dirty or defective - Service or replace fuel pump.
Problems with carburetor adjustment - Adjust as required.
Restricted fuel lines - Service fuel lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Dirty fuel filter - Install new filter.
Gaskets are damaged - Change gaskets.
Water intake screen is dirty - Need to wash or clean.
Faulty choke system - Check and repair choke system.
| Engine overheating |
Engine is under excessive load - Load reducing is recommended.
Too lean fuel mixture in carburetor - Use proper settings.
Ignition timing is incorrect - Set the ignition timing properly.
Damaged thermostat - Thermostat need to be replaced.
Water pump malfunction - Install new water pump.
Incorrect propeller selection - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Lack of engine oil - Check and refill engine oil.
Oil pump malfunction - Oil pump need to be replaced.
Water intake is blocked - Need to wash or clean.
Valve setting is wrong - Valves needs to be adjusted properly.
| Abnormal engine knocking or noise |
Stale gasoline - Change gasoline.
Excessive engine load - Reduce engine load.
Low idle speed set incorrectly - Correct idle settings.
Fuel pump is clogged or faulty - Check fuel pump and change if required.
Crankshaft or main bearings failure - Change defective components as required.
Piston rings or cylinder bore are worn - Replace defective parts.
| Engine loses power |
Carburetor is improperly adjusted or clogged - Adjust the carburetor properly or clean it.
Clogged or defective fuel pump - Service or replace fuel pump.
Ignition system failure - Inspect ignition system and change failed components.
Cylinder head gasket is blown - Change cylinder head gasket.
Damaged powerhead parts - Replace defective components.
Burned or stuck valves - Service or replace valves.
Improper propeller diameter or pitch - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Engine mounted at wrong transom height - Check the outboard engine mounting height.
Incorrect trim angle - Adjust trim angle.
| High fuel consumption |
Improper adjustment of carburetor main jet - Adjust it properly.
Faulty or loose spark plug - Tighten or replace spark plug.
Piston, sleeve, or rings are damaged - Replace faulty parts.
| Excessive motor vibration |
Damaged or improper size of propeller - Have propeller repaired or replaced.
Propeller shaft malfunction - Have propeller shaft replaced.
Weeds in the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
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