SBT Jetski Engines, Parts & Accessories

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  1. #1
    Joined
    Jun 2011
    From
    Tarpon Springs
    Posts
    18

    Default Valve hitting piston on F12

    My 2004 F12 (non-turbo) lost a cylinder when one of the exhaust valves hit the piston. I am not sure if the cause was a bad valve retaining clip or the springs were getting weak and allowed the valves to float at high RPM's.

    There were only about 250 hours on the engine and it had never been taken apart.

    Anyone hear of simular problems?

  2. #2
    Joined
    Mar 2003
    From
    SBT
    Posts
    21,555

    Default Re: Valve hitting piston on F12

    Too much carbon on the valve stem or small amount of rust can make the valve stick in the guide and the piston contacts it. We see more of this on yamaha skis then any other brand.
    SBT Tech Support is here to help with your problems.
    We try to answer each question quickly and accurately.
    Please do not use Private Messaging for Tech Support, use the forums.

  3. #3
    Joined
    Jun 2011
    From
    Tarpon Springs
    Posts
    18

    Default Re: Valve hitting piston on F12

    Thank you for your expertise!

  4. #4
    Joined
    Mar 2019
    From
    Tabalanoon
    Posts
    1

    Default Re: Valve hitting piston on F12

    Wow, Awesome... :) :) :)

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