Suzuki DF9.9A Troubleshooting
| Engine Model: Suzuki DF9.9A |
| Engine Type: 4-stroke 2-cylinder OHC gasoline outboard engine |
| Total Displacement: 12.7 cu.in (208 cc) |
| Rated Engine Power: 9.9 Hp (7.3 kW) at 6200 rpm |
| Fuel System: Carburetor |
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| Engine will not start or starts up hard |
Gas tank is empty - Fill fuel up.
Incorrect fuel grade - Use quality fuel.
Dirty fuel lines - Inspect and clean.
Spark plug wiring connection is damaged - Check the spark plug wire connection, repair or replace.
Spark plug is faulty - Install new spark plug.
Clogged fuel filter - Install new filter.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Fuel lines are clogged - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Defective fuel pump - Replace or rebuild fuel pump.
Throttle cable is damaged or adjusted incorrectly - Replace cable or adjust properly.
Valve clearance is improper - Check and adjust.
Valve timing is wrong - Set the valve timing correctly.
| Engine starts but then stalls |
Spark plug is damaged - Replace spark plug.
Carburetor is clogged or defective - Replace or service carburetor.
Faulty ignition coil - Ignition coil should be replaced.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump is faulty - Replace or repair fuel pump.
Faulty choke system - Check and repair choke system.
Excessive valve clearance - Adjust to proper valve clearance.
Valve timing is incorrect - Set the valve timing properly.
Valve springs are damaged or weak - Change valve springs.
Valves sticking - Valves need to be cleaned.
| Engine runs intermittently |
Ignition system problems - Test ignition and replace failed parts.
Clogged or defective fuel pump - Check fuel pump and replace if necessary.
Carburetor is not adjusted - Check carburetor float adjustment.
Clogged fuel lines - Clean fuel lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel filter is dirty - Replace fuel filter.
Gaskets are defective - Install new gaskets.
Clogged water intake - Need to clean or wash.
Faulty choke system - Check and repair choke system.
Engine overload - Reduce the load.
Carburetor mixture is too lean - Adjust carburetor correctly.
Bad ignition timing - Adjust ignition timing as required.
Defective thermostat - Change thermostat.
Water pump is defective - Change water pump as required.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor is mounted too high or too low - Position the engine correctly.
Low engine oil level - Check and refill engine oil.
Defective oil pump - Install new oil pump.
Dirty water intake screen - Clean and wash as required.
Wrong valve setting - Set the valves correctly.
Low octane fuel - Use proper gasoline.
Engine is overloaded - Load reducing is recommended.
Improperly adjusted low idle speed - Need to adjust idle speed.
Fuel pump is faulty or clogged - Clean or change fuel pump.
Main bearings or crankshaft wear - Have bearings or crankshaft replaced.
Cylinder bore or piston rings are damaged - Change faulty components.
Carburetor is dirty or incorrectly adjusted - Clean or correctly adjust carburetor.
Dirty or defective fuel pump - Clean or replace fuel pump.
Ignition failure - Inspect ignition system and change failed components.
Worn cylinder head gasket - Change cylinder head gasket.
Powerhead parts are damaged - Change defective parts.
Stuck or burned valves - Replace or clean valves.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard motor mounting height is set incorrectly - Have motor adjusted to proper transom height.
Improper trim angle - Make the correct trim angle adjustment.
| Engine using too much gasoline |
Carburetor main jet is improperly adjusted - Adjust it correctly.
Defective or loose spark plug - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Replace faulty parts as required.
| Excessive engine vibration |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Loose or faulty steering pivot Tighten correctly or replace.
Battery voltage is low - Recharge the battery.
Battery drains quickly - Service or change the battery.
Disconnected battery cables or bad terminals - Connect wiring properly or install new terminals.
Damaged starter motor - Replace or repair starter.
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| Outboard Engines Technical Specifications |
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