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Yamaha 97 Waverunner Engine races during flush

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  • Yamaha 97 Waverunner Engine races during flush

    When I start engine flush on 97 Yamaha Waverunner, the engine starts racing uncontrollably. Must stop flush using emergency shut down by pulling string off handlebar. Very afraid I will blow engine. Other symptoms include engine conks out sometimes when doing quick accelerate onto dock - don't know if that is related. Otherwise, ski performs ok and makes up to 42mph out on the water and there is no uncontrollable engine racing. I've heard this may be a vaccume leak. What should I be looking for?

  • #2
    Re: Yamaha 97 Waverunner Engine races during flush

    Not a vacuum leak, an air leak into the crankcase.
    Possible crank seals leaking.
    Intake manifold, or carb gaskets leaking.

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    • #3
      Re: Yamaha 97 Waverunner Engine races during flush

      I had same problem.
      Engine racing upon squirting when out of water with no load.
      Took it to yamaha frankston & got carbs fine tuned, fixed problem

      Sent from my SM-N950F using Tapatalk

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      • #4
        Re: Yamaha 97 Waverunner Engine races during flush

        How can anybody ever resolve what you are trying to say ???????
        Firstly the page will not translate into English
        Secondly the link is dead
        See pic

        Sent from my SM-N950F using Tapatalk

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