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| Home / Outboard Engines / Suzuki Engines / Suzuki DF9.9 |
Suzuki DF9.9 Troubleshooting
The Suzuki DF9.9 is a four-stroke two-cylinder single overhead camshaft gasoline outboard engine. This engine has a carburetor fuel system, wet sump lubrication, water cooled with thermostat, and pointless electronic ignition (PEI). A 18.4 cu.in (302 cc) outboard motor has a cylinder bore of 2.28" (58 mm), piston stroke of 2.24" (57 mm), and maximum power of 9.9 hp (7.3 kW) at 4900-5500 rpm. The boat motor is equipped with a manual or electric starting system, 3-blades aluminum standard propeller, manual trim and tilt, and tiller handle or remote control steering system. The fuel tank has a capacity of 3.2 gal (12 liters).
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| Engine starts up hard or won't start |
No fuel in fuel tank - Add fuel.
Wrong grade of gasoline - Change fuel.
Air or water in fuel system - Remove water or air from fuel system.
Defective wiring connection of spark plug - Check the spark plug wire connection, repair or replace.
Damaged spark plug - Change spark plug.
Fuel filter is plugged - Fuel filter needs changing.
Carburetor settings incorrect - Adjusting as required.
Restricted fuel lines - Service fuel lines.
Fuel tank air vent clogged or closed - Open or service air vent.
Fuel pump malfunction - Install new fuel pump or rebuild it.
Not adjusted or damaged throttle cable - Replace cable or adjust correctly.
Valve clearance is not correct - Check and adjust.
Valve timing is wrong - Adjust valve timing as required.
| Engine stalls after starting |
Defective spark plug - Replace spark plug.
Carburetor is clogged or faulty - Replace or service carburetor.
Defective ignition coil - Ignition coil must be replaced.
Fuel tank air vent closed or restricted - Open or service air vent.
Fuel pump is faulty - Install new fuel pump or rebuild it.
Choke system is damaged - Check and repair choke system.
Valve clearance is not correct - Need to adjust valve clearance.
Incorrect valve timing - Set the valve timing properly.
Valve springs are worn or loose - Change valve springs.
Stuck valves - Service the valves.
| Engine runs intermittently |
Ignition system is defective - Test ignition and replace failed parts.
Clogged or defective fuel pump - Test fuel pump and change if necessary.
Carburetor malfunction - Check and repair as required.
Restricted fuel lines - Clean fuel lines.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Fuel filter is plugged - Fuel filter needs to be replaced.
Gaskets are damaged - Replace gaskets.
Dirty water intake screen - Clean and wash as required.
Damaged choke system - Check and repair choke system.
| Engine is overheated |
Engine overload - Load reducing is recommended.
Too lean carburetor mixture - Use proper settings.
Bad ignition timing - Ignition timing needs to be adjusted correctly.
Thermostat is defective - Install new thermostat.
Defective water pump - Water pump need to be replaced.
Improper propeller diameter or pitch - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard engine is positioned too low or too high - Mount the motor as required.
Engine oil level is low - Need to add 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.
| Engine knocks or noises |
Stale gasoline - Use correct gasoline.
Engine is under excessive load - Load reducing is recommended.
Incorrectly adjusted low idle speed - Adjust idle speed.
Dirty or defective fuel pump - Inspect fuel pump and change as required.
Worn crankshaft or main bearings - Have bearings or crankshaft replaced.
Damaged piston rings or cylinder bore - Change faulty components.
| Loss of engine power |
Improperly adjusted or dirty carburetor - Service or correctly adjust carburetor.
Dirty or damaged fuel pump - Clean or install new fuel pump.
Defective ignition - Inspect ignition system and change failed components.
Defective cylinder head gasket - Replace the gasket as required.
Powerhead components are faulty - Change defective parts.
Valves are stuck or burned - Change or clean valves.
Propeller pitch or diameter incorrect - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Incorrect outboard motor mounting height - Check the outboard engine mounting height.
Improper trim angle - Adjust trim angle.
| High fuel consumption |
Incorrect carburetor main jet adjustment - Adjust the carburetor main jet correctly.
Spark plug is loose or faulty - Spark plug need to be tightened or replaced.
Sleeve, rings, or piston are damaged - Replace defective parts as required.
| Excessive motor vibration |
Damaged or bent propeller - Have propeller repaired or replaced.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds wraped around propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is faulty or loose Tighten correctly or replace.
| Starter is not cranking |
Battery power is low - Battery is drained, charge it.
Battery runs out quickly - Service or replace the battery.
Corroded battery terminals or disconnected wires - Connect cables correctly or replace terminals.
Starter motor failure - Starter should be replaced.
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