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  1. #1
    JohnCiccarelli's Avatar
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    Question Strange Strange How can this be?

    I am playing with my first Yamaha. I started it out of the water. It instantly reved up. I pulled the lanyard and nothing happened. Hit the off switch nothing happened. I finally pulled both plug wires off and it would not stop. My last resort was to choke the motor and it stopped running. How is this possible? This was scary.


  2. #2
    Moderator Insanediego Joe's Avatar
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    You just had your first lean runaway.. you have a massive airleak either @ the carbs or @ the head.. The best way to stop a lean runaway is to hold the throttle wide open and it will stop. Time to pull the carbs and pull the head to see what the damage is if any and find your air leak!

  3. #3
    If your not doing something, its hard to screw up. stlouisramsfan's Avatar
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    Quote Originally Posted by Insanediego Joe View Post
    You just had your first lean runaway.. you have a massive airleak either @ the carbs or @ the head.. The best way to stop a lean runaway is to hold the throttle wide open and it will stop. Time to pull the carbs and pull the head to see what the damage is if any and find your air leak!
    + 1

  4. #4
    it can also happen on carbs that have no fuel in them I make sure I prime my carbs after a rebuild , it also doesn't happen when the ski is in the water , the load is enough to prevent it from running away but other damage will occur

  5. #5

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    Quote Originally Posted by ZMANN View Post
    it can also happen on carbs that have no fuel in them I make sure I prime my carbs after a rebuild , it also doesn't happen when the ski is in the water , the load is enough to prevent it from running away but other damage will occur
    +1 this happened to me once the carbs where full of fuel it was fine, but i did not let it rev to the moon

  6. #6
    JohnCiccarelli's Avatar
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    I was told that the motor was just rebuilt last year. I put it in the water and it runs but seems sluggish to me. It runs about 35 MPH and slow getting on plane.

  7. #7
    crashhard's Avatar
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    time to check the compression

  8. #8
    SHOBiz's Avatar
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    Unfortunately you cannot trust, 'was rebuilt last year', or last month or whatever. Takes these guys advice and start checking things out.

    Still.. some wild shyt...

  9. #9
    sharkriver's Avatar
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    What model and year yamaha are we talking about?
    Well I guess if you choked it its not a 1300 efi!
    Do any other models give codes on the gauge cluster?

  10. #10
    I think it was a 94 650 Waverunner 3

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