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  1. #1
    papafever's Avatar
    Join Date
    Aug 2009

    Need help with a F15X.

    My friend has a f15x, whe did some stuff to the ski and was boosting 17 psi at 7100 rpm and it ran close to 75 mph. We kept the afr between 11.8 and 11.9 at WOT , the ski was riding perfect for three or four hrs and it melt piston # 4. We took it apart and it looks like it hit a valve. Has this happen to anyone or maybe this engines cant hold this much boost.

  2. #2
    I build Horsepower
    NitroShark's Avatar
    Join Date
    Jan 2006
    Valve springs are not made for 17PSI.

    That's why I sell a kit to replace them since 2003,the F15 springs are not any better. email me for current prices as titanium cost varies from month to month.


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