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  1. #1
    ktyamaha36's Avatar
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    Exatly how does the Rave valve on the water box work?

    Someone school me on how the rave valve on the seadoo water box's work? I know they control the flow of water...but how and when would one adjust the red cap for peak performance? All ive ever been told is do not mess with it...


  2. #2
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    Its not really called a RAVE valve, even though it says it on top, its called a water pressure regulator.
    it works by exhaust pressure,
    at idle, the water from the pump is bypassing that valve and entering the midpipe.
    as the pressure rises, when the gas is pressed harder, the valve starts to close and delivers less water to the midpipe at peak RPM's
    at WOT the valve is closed, but still lets a small amount of water through to keep the exhaust couplers cool.

    2 strokes exhaust dont like water, the dryer they run the faster they go BUT we can't do that or else we would melt the couplers.
    the reason the water is reduced cause a 2 stroke uses the tuned pipe, to keep the fresh fuel charge in the combustion chamber,
    the sonic BOOM from the exhaust gas resonates back up the pipe, and keeps the fresh fuel charge in place.
    the more water thats delivered into the exhaust system the less performance you will get.


    by screwing the cap in you will allow more water into your exhaust at idle, and midrange,
    I'm not sure regarding on your ski, all skis are different due to size, KrUNCH might be able to help he has many 951's

  3. #3
    ktyamaha36's Avatar
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    Im not asking as to any specific ski, just in general. So basically to "fine tune" a ski you would want the cap out as far as possible for the least amount of water going through the pipe without melting the couplers?

  4. #4
    SURFnTURF's Avatar
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    Quote Originally Posted by ktyamaha36 View Post
    Im not asking as to any specific ski, just in general. So basically to "fine tune" a ski you would want the cap out as far as possible for the least amount of water going through the pipe without melting the couplers?
    No you cannot control flow or volume, you can only have some(very little) control over the timing of the flow when it starts to reduce as revs start to build.The water valve adjustment has very little effect on performance,leave it alone.

  5. #5
    96XPSS's Avatar
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    I disagree. What you said KT is true, but by doing so, you sacrifice a little bottom end as it closes sooner, thus resulting in hurting the bottom and midrange. Normally two clicks out works best. You gain around 40 rpm too.

  6. #6
    SURFnTURF's Avatar
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    To gain 40 rpm at WOT you will sacrifice acceleration times considerably as the stock pipe works better with water entering sooner at lower rpms.The gain you have at WOT will be considerably less in low and mid range acceleration.Around a track the ski with the water valve turned down will always beat a boat with the valve turned out.Try it and see the difference in the two , with the valve up they feel flat and slower with a distinct difference in exhaust sound.

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