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How To Flush Your Motor

 

Yamaha has made this procedure about as easy as it can be by including a flushing attachment on the motor. For best results, this procedure should be done right after operating the motor, while it's still warm, but anytime is better than never. Ideally the motor should be flushed after every use in salt or brackish water, water that has mineral content, or when used in muddy/silty water.

 

flusher attachment on yamaha outboard motor

 

NOTICE: Do not perform this procedure while the engine is running. The water pump may be damaged and severe damage from the overheating can result

 

  • 1. Disconnect the freshwater adapter hose from the fitting on the bottom of the cowling.
  • 2. Connect the freshwater adapter hose to the garden hose.
    • flushing a yamaha outboard motor
  • 3. With the engine off, turn on the water supply and let the water flush through the cooling passages for about 15 minutes. Some motor models will not have water coming out of the telltale hole.
  • 4. Turn off the water supply and disconnect the freshwater flush adapter hose from the garden hose.
  • 5. Reattach the freshwater flush adapter hose to the fitting on the bottom cowling and tightened it securely.
  • NOTICE: If the freshwater flush adapter hose is not properly reconnected to the fitting on the lower cowling, cooling water will leak out of the flushing hose and the engine can overheat causing severe damage.

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    Tip: If the boat remains in the water, tilt the outboard motor up until it is completely out of the water. This will allow the freshwater to flush out the water and exhaust passages in the midsection and lower unit that would otherwise remain below water lever.

     

    If you really want to run the engine while flushing, you must use an outboard engine flush attachment on the lower unit. The engine should only run in neutral at an idle speed. For personal safety, the propeller should be removed to prevent contact if accidentaly shifted into gear. And never leave a motor unattended while it is running.

     

    flushing yamaha outboard motor with lower unit attachment