Rear Exhaust Conversion Issue?
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  1. #1
    Frequent Poster slowx2's Avatar
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    Rear Exhaust Conversion Issue?

    So I did a rear exhaust conversion on my 440 to 650 conversion ski and I have noticed that whenever the back of the ski is under water a decent ways it loses a lot of power until the ski gets moving. I was thinking I need to put in a one way valve on the exhaust but am not sure what is needed to do that. Looking for help/ideas on how to fix this issue.

    Thanks
    Current skis:79 js440/650 flat deck, 94 fx-1, 88 650sx
    Past skis: 91 550sx with 650 conversion, 88 650sx, 87 X2, 86 js550, 85 js550, 78 js440, 77 js440

  2. #2
    PWCToday.com Is My Home Away From Home Benflynn's Avatar
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    Re: Rear Exhaust Conversion Issue?

    Is it a straight pipe or have a bend, I think water only normally goes to that bend hoop

  3. #3
    Frequent Poster slowx2's Avatar
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    Re: Rear Exhaust Conversion Issue?

    There is a bend right after the water box but then its pretty straight out the back.
    Current skis:79 js440/650 flat deck, 94 fx-1, 88 650sx
    Past skis: 91 550sx with 650 conversion, 88 650sx, 87 X2, 86 js550, 85 js550, 78 js440, 77 js440

  4. #4
    PWCToday.com Is My Home Away From Home Benflynn's Avatar
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    Re: Rear Exhaust Conversion Issue?

    On a 650, that bend is at the tray, in front of where a foot hold would go, so if it's all the way at the front u will have to clear it when u go from a stop

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