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  1. #1
    PWCToday Regular Case1's Avatar
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    96 XP WOT only 6350 RPM's

    So I was out jumping some really big waves yesterday and the thing was running great! I went to ride today on smooth water and I noticed that the RPM's were in the 6300's and the free GPS app (Speed Box) was only showing 47 mph tops.

    I recently rebuilt the carbs and have a newly rebuilt engine. It's not hesitating off the start and the engine seems to be running smoothly.

    Any suggestions on what I might check?

    Casey

  2. #2
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Are the rave valves stuck? Also try riding with the seat off and look for water spraying from somewhere (water regulator on the waterbox and headpipe to exhaust mani gasket are common places)or exhaust smoke in the hull.

  3. #3
    PWCToday Regular Case1's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    How do you tell if they are stuck? Sheesh, I only have 15 hours on this newly rebuilt engine. I know that they were shaved down on the rebuild. I will also check the other things you mentioned

  4. #4
    PWCToday.com Is My Home Away From Home Matt Braley's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    They should not be stuck at 15 hrs even if you were running cheap oil and too much of it. To check push the wire retaining clip back off the black rave cap with your thumbs and be carful not to drop the spring underneath. Then you can grab the circle part(bellows over a rave piston) and slide in and out, or at least you should be able to.

  5. #5
    PWCToday Regular Case1's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Thanks, Matt! I will check them tomorrow just to make sure they are not stuck. I only run Seadoo Synthetic. Just curious...what would cause smoke in the hull?

    Also, what RPM's should I be getting with this engine on WOT? It is the high-performance rebuild from Seadoo Engine Shop.
    Last edited by Case1; 10-25-2017 at 11:05 PM.

  6. #6
    I dream skis JC-SuperJet's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Smoke in the hull would mean an exhaust leak. Check and tighten all the exhaust joints and hoses. Exhaust leaks result in a drop in performance.

  7. #7
    PWCToday Regular Case1's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Thanks, JC!
    Last edited by Case1; 10-25-2017 at 11:37 PM.

  8. #8
    Resident Guru hafweigthr's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Quote Originally Posted by JC-SuperJet View Post
    Smoke in the hull would mean an exhaust leak. Check and tighten all the exhaust joints and hoses. Exhaust leaks result in a drop in performance.
    Ditto --- smoke in hull will cause significant running problems due to lack of combustion oxygen. A malfunctioning water regulator will also stop your ski at near that rpm. Most common problem is the ferrous(rusty) spring clip that is used to hold the bottom of the diaphragm to the valve pokes a hole in the diaphragm and it leaks through. Then it will not work correctly to adjust water flow for peak rpm.
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  9. #9
    Resident Guru SpitAndDirt's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    Quote Originally Posted by hafweigthr View Post
    A malfunctioning water regulator will also stop your ski at near that rpm. Most common problem is the ferrous(rusty) spring clip that is used to hold the bottom of the diaphragm to the valve pokes a hole in the diaphragm and it leaks through. Then it will not work correctly to adjust water flow for peak rpm.
    I will have to find some pictures, but I used stainless steel safety wire to replace the carbon steel spring clip. I didn't tie the wire too tight, just enough to give good clamping pressure.

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  10. #10
    PWCToday Regular Case1's Avatar
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    Re: 96 XP WOT only 6350 RPM's

    First off, thanks for y'alls help.

    Here is what I saw when I road it just a minute ago. Is this the water regulator on top of the water box? Water was leaking out of the bottom of it. I didn't notice any smoke, although I didn't ride it long enough really to see.
    IMG_3743.jpg
    Last edited by Case1; 10-26-2017 at 07:31 PM.

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