Suzuki DF9.9B Troubleshooting
| Engine Model: Suzuki DF9.9B |
| Engine Type: 4-stroke 2-cylinder OHC 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 hard to start or won't start |
No fuel in fuel tank - Add gasoline.
Low-quality gasoline - Use correct gasoline grade.
Dirty fuel system - Check and clean.
Spark plug wiring connection is damaged - Check the spark plug wire connection, repair or replace.
Spark plug is damaged - Change spark plug as required.
Fuel filter is plugged - Fuel filter needs changing.
Vapor separator needle valve is damaged or worn - Replace needle valve.
Clogged fuel lines - Clean fuel system lines.
Fuel tank air vent clogged or closed - Open or clean air vent.
Fuel feed pump malfunction - Install new feed pump or repair it.
Throttle cable is damaged or adjusted incorrectly - Adjust properly or change the cable.
Valve clearance is not correct - Check and adjust.
Incorrect valve timing - Adjust valve timing correctly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Damaged or clogged fuel injector - Clean or install new injector.
Fuel regulator is faulty - Change fuel regulator.
Electronic control modul is not operating - Replace ECM.
| Engine starts and stops immediately |
Spark plug is defective - Spark plug need to be replaced.
Vapor separator needle valve is bend or wear - Install new needle valve.
Ignition coil is not working - Ignition coil must be replaced.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump malfunction - Change or rebuild fuel pump.
Faulty choke system - Check and repair choke system.
Valve clearance is not correct - Check and adjust.
Valve timing is improper - Set the valve timing correctly.
Valve springs are weak or broken - New valve springs need to be installed.
Stuck valves - Valves need to be cleaned.
Low cylinder compression - Inspect and replace defective parts.
Fuel filter is dirty - Fuel filter needs changing.
Fuel injector is dirty or worn - Replace or clean as required.
Engine oil level is low - Fill the crankcase with engine oil.
Oil pump failure - Replace oil pump.
Dirty water intake screen - Need to clean or wash.
Damaged thermostat - Replace thermostat.
Water pump is defective - Install new water pump.
Ignition system problems - Inspect ignition system and change faulty parts.
Dirty or damaged fuel pump - Check fuel pump and replace if necessary.
Damaged or wear vapor separator needle valve - Install new needle valve.
Clogged fuel lines - Clean fuel system lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Fuel filter is plugged - Change fuel filter.
Intake manifold air leaks - Install new gasket.
Dirty water intake screen - Need to clean or wash.
Throttle valve and throttle link are defective or worn - Change faulty parts.
Fuel injector is faulty or clogged - Replace or clean as required.
Engine is overloaded - Load reducing is recommended.
Fuel pump or fuel injector is clogged - Clean or replace as required.
Ignition timing is incorrect - Ignition timing needs to be adjusted correctly.
Thermostat failure - Change thermostat as required.
Water pump failure - Change water pump as required.
Improper propeller diameter or pitch - Replace propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Position the engine correctly.
Engine oil level is low - Fill up the engine oil.
Damaged oil pump - Change oil pump as required.
Dirty water intake screen - Clean and wash as required.
Improper valve setting - Set the valves correctly.
Stale or low octane fuel - Change gasoline.
Excessive engine load - Reduce engine load.
Low idle speed setting is incorrect - Adjust idle speed.
Clogged or damaged fuel pump - Service or change fuel pump.
Worn main bearings or crankshaft - Change or repair worn components.
Worn piston rings or cylinder bore - Change faulty parts.
Dirt in the fuel lines - Fuel lines must be clean.
Fuel injector is damaged - Install new fuel injector.
Clogged or damaged fuel pump - Service or change fuel pump.
Ignition system problems - Test ignition and replace failed parts.
Cylinder head gasket is blown - Replace the head gasket.
Worn powerhead components - Replace defective parts.
Valves are burned or stuck - Replace or clean valves.
Incorrect propeller selection - Replace propeller.
Propeller bent or damaged - Replace propeller.
Incorrect outboard motor mounting height - Check the outboard engine mounting height.
Incorrect trim angle - Adjust trim angle.
Fuel injector is faulty or clogged - Clean or install new injector.
Loose or defective spark plug - Spark plug need to be tightened or replaced.
Rings, sleeve, or piston are damaged - Replace faulty components.
Electronic control unit failure - Change electronic control unit.
| Excessive motor vibration |
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds wraped around propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Low battery voltage - Battery needs to be recharged.
Battery drains quickly - Battery needs to be serviced or replaced.
Disconnected wires or corroded battery terminals - Check wiring and clean or replace terminals.
Faulty starter motor - Repair or install a new starter.
| Trim motor runs but trim system does not move up or down |
Insufficient oil - Need to add the oil.
Damaged pump assembly - Check pump and replace if necessary.
Leakage of manual drain valve - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Replace worn component.
| Trim cannot be fully up or down |
Pump assembly faulty - Change pump as required.
Tilt ram piston ball is displaced - Service or repair.
Worn tilt ram piston O-ring - Change O-ring.
Not enough oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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