Suzuki DF9.9BS Troubleshooting
| Engine Model: Suzuki DF9.9BS |
| Engine Type: 4-stroke 2-cylinder short shaft gasoline outboard engine |
| Total Displacement: 20.1 cu.in (327 cc) |
| Rated Engine Power: 9.9 Hp (7.3 kW) at 5700 rpm |
| Fuel System: Multi-point sequential electronic fuel injection |
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| Engine starts up hard or doesn't start |
Empty fuel tank - Fill it up.
Wrong grade of gasoline - Use correct gasoline grade.
Water or air in fuel system - Remove air or water from system.
Spark plug wiring connection is defective - Inspect spark plug wiring connection, change or repair.
Spark plug is faulty - Change spark plug.
Dirty fuel filter - Replace or clean fuel filter.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Fuel lines must be clean.
Fuel tank air vent clogged or closed - Open or service air vent.
Faulty fuel feed pump - Replace or repair fuel pump.
Improperly adjusted or worn throttle cable - Replace cable or adjust correctly.
Valve clearance is incorrect - Adjust to proper valve clearance.
Incorrect valve timing - Set the valve timing correctly.
Low fuel pressure - Inspect fuel system for leaks or inspect low pressure fuel pump.
Clogged or worn fuel injector - Clean or replace as required.
Fuel regulator is faulty - Install new fuel regulator.
ECM is faulty - Install new ECM.
| Engine starts but then stalls |
Spark plug is faulty - Replace spark plug.
Vapor separator needle valve is damaged or worn - Change vapor separator needle valve.
Damaged ignition coil - Ignition coil should be replaced.
Closed or clogged fuel tank air vent - Open or service air vent.
Fuel pump defective - Change or rebuild fuel pump.
Damaged choke system - Inspect and replace choke system components.
Valve clearance is incorrect - Need to adjust valve clearance.
Valve timing is improper - Adjust valve timing as required.
Bad or damaged valve springs - Install new valve springs.
Valves are stuck - Clean the valves.
Poor compression - Check and replace worn parts.
Plugged fuel filter - Fuel filter needs changing.
Fuel injector is damaged or dirty - Replace or clean if necessary.
Low engine oil level - Need to add engine oil.
Oil pump malfunction - Install new oil pump.
Clogged water intake - Need to wash or clean.
Damaged thermostat - Replace thermostat.
Damaged water pump - Change water pump.
Ignition failure - Check ignition and replace faulty components.
Clogged or defective fuel pump - Clean or change fuel pump.
Vapor separator needle valve is bend or wear - Replace needle valve.
Restricted fuel lines - Fuel lines must be clean.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel filter is dirty - Fuel filter needs changing.
Intake manifold air leaks - Install new gasket.
Water intake is blocked - Need to wash or clean.
Throttle valve and throttle link are defective or worn - Change faulty parts.
Damaged or clogged fuel injector - Replace or clean as required.
Engine is overloaded - Load reducing required.
Clogged fuel pump or fuel injector - Clean or replace as required.
Ignition timing is wrong - Ignition timing needs to be adjusted correctly.
Thermostat is faulty - Change thermostat.
Damaged water pump - Replace water pump.
Propeller selection improperly - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard engine is mounted too high or too low - Mount the motor as required.
Engine oil insufficient - Add oil to the engine crankcase.
Oil pump malfunction - Oil pump need to be replaced.
Water intake is clogged - Need to clean or wash.
Improper valve setting - Set the valves properly.
Stale fuel - Use proper fuel.
Excessive engine load - Load reducing is recommended.
Improperly adjusted low idle speed - Adjustment required.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Crankshaft or main bearings failure - Change or repair worn components.
Damaged piston rings or cylinder bore - Change defective components.
Fuel lines are dirty - Service fuel lines.
Defective fuel injector - Change fuel injector.
Clogged or defective fuel pump - Clean or install new fuel pump.
Ignition system malfunction - Check ignition and replace faulty components.
Worn cylinder head gasket - Install new head gasket.
Powerhead components are faulty - Change defective parts.
Burned or stuck valves - Clean or change valves.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Engine mounted at wrong transom height - Check the outboard motor mounting height.
Improper trim angle - Adjust trim angle.
Fuel injector is faulty or clogged - Clean or replace if necessary.
Defective or loose spark plug - Tighten or replace spark plug.
Worn rings, piston, or sleeve - Change defective components.
ECU failure - Replace ECU.
Damaged or bent propeller - Have propeller repaired or replaced.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds wraped around propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Steering pivot is faulty or loose Tighten or replace.
Battery power is low - Battery needs to be recharged.
Battery is draining quickly - Service battery or replace it.
Terminals are faulty or battery cables are disconnected - Check cables and clean or change terminals.
Starter motor is damaged - Repair or change starter.
| Trim motor is running but trim system cannot move up or down |
Not enough oil - Check oil level and add oil as required.
Pump assembly is defective - Test pump and change if necessary.
Leakage of manual drain valve - Close the valve or change it.
Faulty pump driveshaft or motor - Change defective component.
| Trim cannot be fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is displaced - Service or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Insufficient oil - Fill up oil to required level.
Lower check valve not seating in port side trim ram - Install valve correctly.
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