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Tohatsu M15D2 Troubleshooting
The Tohatsu M15D2 is a 2-stroke 2-cylinder forced water-cooled gasoline outboard engine with a rated power of 15 hp (11 kW) at 5200-5800 rpm. The engine cylinder bore is 2.17" (55 mm) and piston stroke is 2.05" (52 mm). A 15.1 cubic inches (247 cc) outboard motor has a carburetor fuel system, starting system with manual starter, flywheel magneto capacitor discharge ignition system, dog clutch shift system, manual trim/tilt, and handle tiller steering. The fuel tank capacity is 6.6 gal (25 liters). The propeller is made of aluminum and it has three blades.
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| Engine difficult to start or won't start |
Fuel tank is empty - Add gasoline.
Wrong fuel grade - Use correct fuel grade.
Water or air in fuel system - Remove air or water from system.
Defective wiring connection of spark plug - Inspect spark plug wiring connection, change or repair.
Damaged spark plug - Change spark plug as required.
Dirty fuel filter - Replace fuel filter.
Carburetor not adjusted - Adjust according to instructions.
Dirt in the fuel lines - Fuel lines need to be cleaned.
Closed or clogged fuel tank air vent - Open or service air vent.
Low fuel pump pressure - Install new pump or repair it.
Worn or defective reed valve - Replace reed valve.
| Engine starts but stalls suddenly |
Faulty spark plug - Change spark plug as required.
Carburetor is dirty or faulty - Replace or service carburetor.
Damaged ignition coil - Install a new ignition coil.
Fuel tank air vent clogged or closed - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Install new pump or repair it.
| Engine runs intermittently |
Ignition system problems - Test ignition and replace failed parts.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Carburetor problems - Carburetor diagnostics required.
Fuel lines clogging - Fuel lines need to be cleaned.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel filter is clogged - Fuel filter needs changing.
Worn gaskets - Install new gaskets.
| Engine is overheated |
Engine overloaded - Load reducing is recommended.
Carburetor fuel mixture is too lean - Set the carburetor correctly.
Ignition timing is improper - Adjust ignition timing correctly.
Thermostat failure - Change thermostat.
Damaged water pump - Change water pump as required.
Propeller selection improperly - Replace propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard motor is positioned too low or too high - Mount the motor as required.
| Engine noise or knocking |
Stale or low octane fuel - Use proper fuel.
Engine overload - Load reducing is recommended.
Low idle speed set incorrectly - Correct idle settings.
Fuel pump is faulty or clogged - Test fuel pump and replace if necessary.
Main bearings or crankshaft are worn out - Repair or replace defective parts.
Worn piston rings or cylinder bore - Change faulty components.
| Low engine power |
Clogged or improperly adjusted carburetor - Carburetor needs to be adjusted correctly or cleaned.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Ignition failure - Check ignition and replace faulty components.
Gaskets are defective - Replace gaskets.
Faulty powerhead parts - Replace defective parts as required.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or improper size of propeller - Replace propeller.
Incorrect outboard motor mounting height - Check the outboard engine mounting height.
Improper trim angle - Make the correct trim angle adjustment.
| Excessive fuel consumption |
Improper adjustment of carburetor main jet - Adjust main jet as required.
Spark plug is defective or loose - Tighten or replace spark plug.
Sleeve, rings, or piston are damaged - Change defective parts.
| 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 bolt.
Damaged or loose steering pivot Tighten or replace.
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