Tohatsu M9.9D2 Troubleshooting
| Engine Model: Tohatsu M9.9D2 MF |
| Engine Type: 2-stroke 2-cylinder gasoline outboard engine |
| Total Displacement: 15.1 cu.in (247 cc) |
| Rated Engine Power: 9.9 Hp (7.3 kW) at 5300 rpm |
| Fuel System: Carburetor |
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| Engine difficult to start or will not start |
Empty gas tank - Add gasoline.
Incorrect fuel grade - Change gasoline.
Air in the fuel system - Air bleeding.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Spark plug is faulty - Change spark plug as required.
Plugged fuel filter - Fuel filter needs changing.
Carburetor is not adjusted - Check carburetor float adjustment.
Dirty fuel lines - Clean fuel system lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Repair or change fuel pump.
Worn or defective reed valve - Install new reed valve.
| Engine starts and stalls suddenly |
Damaged spark plug - Spark plug need to be replaced.
Carburetor is defective or clogged - Clean or install new carburetor.
Ignition coil is damaged - Ignition coil must be replaced.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Repair or change fuel pump.
Ignition failure - Check ignition and replace faulty components.
Dirty or damaged fuel pump - Service or change fuel pump.
Carburetor incorrectly set - Set carb correctly.
Fuel lines are dirty - Clean fuel system lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Plugged fuel filter - Replace fuel filter.
Damaged gaskets - Change gaskets.
Engine is overloaded - Reduce the load.
Too lean fuel mixture in carburetor - Set the carburetor correctly.
Improper ignition timing - Set the ignition timing properly.
Faulty thermostat - Change thermostat.
Faulty water pump - Change water pump as required.
Incorrect propeller selection - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
Low octane gasoline - Change gasoline.
Engine overloaded - Load reducing required.
Low idle speed setting is incorrect - Correct the settings.
Fuel pump is faulty or clogged - Clean or install new fuel pump.
Crankshaft or main bearings wear - Change defective components as required.
Cylinder bore or piston rings are worn - Replace defective components.
Incorrectly adjusted or dirty carburetor - Service or correctly adjust carburetor.
Clogged or damaged fuel pump - Check fuel pump and replace if necessary.
Defective ignition system - Test ignition and replace failed parts.
Worn gaskets - Install new gaskets.
Powerhead parts are damaged - Replace defective parts as required.
Incorrect propeller selection - Check the propeller size.
Damaged or bent propeller - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Adjust the engine to correct transom height.
Improper trim angle - Make the correct trim angle adjustment.
Incorrect adjustment of carburetor main jet - Adjust it correctly.
Spark plug is loose or defective - Tighten or replace spark plug.
Rings, sleeve, or piston are damaged - Change faulty components.
| Excessive engine vibration |
Damaged or bent propeller - Have propeller repaired or replaced.
Damaged propeller shaft - Replace propeller shaft.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
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| Outboard Engines Technical Specifications |
| Small Engines Technical Specifications |
| Car Engines Technical Specifications |
| Industrial Engines Technical Specifications |
