Troubleshooting a Tohatsu Outboard Motor

Written by breann kanobi
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Troubleshooting a Tohatsu Outboard Motor
Take your boat for a spin after you fix the engine. (ocean image by Yulia Volodina from

Tohatsu outboard motors power boats. Though these motors are designed to withstand constant exposure to rain, wind and salt water, they eventually suffer from problems. Common problems include stale fuel and old spark plugs. Solve easy-to-fix problems on your own and test the outboard motor by taking your boat for a spin. If your boat continues to suffer from problems or will not start or change gears, take it to a mechanic for professional repair.

Skill level:

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Things you need

  • Spark plug wrench
  • Screwdriver
  • Spark plugs
  • Engine oil
  • Fuel

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  1. 1

    Rinse the engine with fresh water. This helps remove the salt and dirt associated with lakes, rivers and oceans.

  2. 2

    Remove the engine's spark plugs using a screwdriver. Replace the spark plugs.

  3. 3

    Turn the flywheel two to three times using the start rope. Drain the fuel from the carburettor, the gas tank and the fuel line.

  4. 4

    Add fresh engine oil to the engine by injecting it into one of the holes created by the missing spark plugs. Turn the flywheel as you inject the oil. This helps distribute the oil throughout the engine evenly.

  5. 5

    Add new fuel to the fuel tank.

  6. 6

    Fix improperly switching gears by changing the gear oil. Remove the gear oil's plugs, located next to the propeller, using a screwdriver. Slide the oil tube nozzle through the hole left by the lower plug. Place one hand on the bad of the oil tube and squeeze. Remove all oil and remove the nozzle. Add 900ml of new oil and replace the plugs.

  7. 7

    Attempt to start the outboard engine. If the engine does not start, take the boat to a mechanic.

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