SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Oct 2018
    From
    Brooklyn NY
    Posts
    1

    Question 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. #2
    Joined
    Jun 2016
    From
    Clearwater, Florida
    Posts
    279

    Default 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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