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  1. #1

    1997 Yamaha GP760-Engine dies at 25-27 MPH

    I have a 1997 Yamaha GP760, but with a 1100 motor installed. I just recently installed a new battery, changed spark plugs and put it out on the water for this first time since last September. The boat was stored in my garage over the winter. The boat started up great, ran great with no hessitation and no bogging or sputtering. When the speedometer hits the 27 MPH mark, the boat motor just cuts off. In cutting off, I mean like you pulled the kill switch. No sputtering, no bogging, nothing. It goes cold turkey.

    Any ideas??????

    Thanks


  2. #2
    mudslanger's Avatar
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    Will it start wright back up or does it just spin over. does it rev up on the trailer. does the motor seem hot when this happens.

  3. #3
    Quote Originally Posted by mudslanger View Post
    Will it start wright back up or does it just spin over. does it rev up on the trailer. does the motor seem hot when this happens.
    It will start back up after 2-3 pushes of the start button. Did some investigation yesterday on the water. I put a can of Seafoam in it, and started on the water. It fires up perfectly and will idle all day long. I gradually gave it gas and rode around at 7-8 mph and after a couple of minutes it dies. I would re-crank again with 2-3 pushes of the start button, no choking required, and would gun it and it would come out of the water plane out and die quickly. Carbs?

  4. #4

    Reply

    I had same type of issue with mine. But I could ride for an hour then suddenly it would cut off. I replaced everything tryingyo find the issue. Ended up being my kill switch was shorting out. The plastic internals went bad. I would try that first.

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