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Suzuki DF9.9A Troubleshooting
The Suzuki DF9.9A is a 4-stroke 2-cylinder OHC (overhead cam) gasoline outboard engine with a rated power of 9.9 hp (7.3 kW) at 5200-6200 rpm. The engine cylinder bore is 2.00" (51 mm) and piston stroke is 2.00" (51 mm). A 12.7 cubic inches (208 cc) outboard motor has a carburetor fuel system, mechanical fuel pump type, pressure lubrication with trochoid pump, starting system with recoil starter, pointless electronic ignition (PEI), 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 doesn't start or starts hard |
Fuel tank is empty - Fill fuel up.
Improper fuel grade - Use correct fuel grade.
Air in fuel system - Bleed fuel system.
Spark plug wire connection are damaged - Inspect the spark plug wire connection, replace or repair.
Defective spark plug - Change spark plug.
Fuel filter is clogged - Install new filter.
Carburetor is not adjusted - Check carburetor float adjustment.
Dirty fuel lines - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump malfunction - Install new pump or repair it.
Worn or improperly adjusted choke cable - Change cable or adjust correctly.
Valve clearance is not correct - Need to adjust valve clearance.
Improper valve timing - Set the valve timing correctly.
| Engine stalls after starting |
Damaged spark plug - Change spark plug.
Carburetor is faulty or dirty - Clean or change carburetor.
Ignition coil is faulty - Replace ignition coil as necessary.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump is faulty - Replace or rebuild fuel pump.
Faulty choke system - Change choke system components as required.
Valve clearance is not correct - Adjust valve clearance.
Valve timing is improper - Adjust valve timing as required.
Broken or bad valve springs - Change valve springs.
Stuck valves - Service the valves.
| Engine runs irregularly |
Defective ignition system - Test ignition and replace failed parts.
Clogged or defective fuel pump - Check fuel pump and change if required.
Carburetor incorrectly set - Set carb correctly.
Fuel lines are clogged - Clean fuel lines.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel filter is clogged - Fuel filter needs to be replaced.
Damaged gaskets - Install new gaskets.
Water intake screen is dirty - Wash or clean as required.
Choke system is damaged - Inspect and replace choke system components.
| Engine overheating |
Engine overloaded - Reduce the load.
Carburetor is running lean - Make the correct settings.
Wrong ignition timing - Adjust ignition timing as required.
Thermostat failure - Change thermostat.
Defective water pump - Replace water pump.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
Low engine oil level - Check and refill engine oil.
Oil pump failure - Change oil pump.
Dirty water intake screen - Wash or clean as required.
Valve setting is incorrect - Set the valves properly.
| Engine noises or knocks |
Low octane gasoline - Change fuel.
Engine overload - Load reducing is recommended.
Incorrectly set low idle speed - Correct idle adjustment.
Fuel pump is faulty or clogged - Clean or install new fuel pump.
Worn main bearings or crankshaft - Change or repair worn components.
Piston rings or cylinder bore are worn - Replace defective components.
| Engine power loss |
Improperly adjusted or dirty carburetor - Service or properly adjust carburetor.
Fuel pump is clogged or faulty - Clean or replace fuel pump.
Defective ignition - Check ignition and replace faulty components.
Cylinder head gasket is defective - Replace the head gasket.
Damaged powerhead parts - Replace defective components as required.
Valves are stuck or burned - Clean or replace valves.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Incorrect outboard motor mounting height - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle.
| Engine using too much gasoline |
Incorrect adjustment of carburetor main jet - Adjust it properly.
Faulty or loose spark plug - Re-tighten or change the spark plug.
Worn sleeve, piston, or rings - Replace defective parts as required.
| Motor vibrates excessively |
Damaged or improper size of propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Loose or faulty steering pivot Tighten or replace.
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