98 XPL RPM drop
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Thread: 98 XPL RPM drop

  1. #1
    PWCToday Regular undertaker's Avatar
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    98 XPL RPM drop

    I need some help with my XPL.

    All stock with the exception of proks, rejetted carbs & "white pipe".
    I was running 7100 rpms for 3 days straight (we were on a family jet ski vacation) and then it dropped to 6400 - 6500 for some reason. Check compression and it was still the same as it was before the rpm drop. Check raves, they seem to be working properly. Reeds are oem and in perfect shape. Ski ran fine but it just would not rev out. It got to the 64-6500 rpm and that was it. This is my first Seadoo and I am at a loss!

    Thanks in advance,
    Ryan

  2. #2
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 98 XPL RPM drop

    Check your pump oil....

  3. #3
    PWCToday Regular undertaker's Avatar
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    Re: 98 XPL RPM drop

    Quote Originally Posted by Grumpy Old Guy View Post
    Check your pump oil....
    Will do, thanks.
    I kinda hope that isn’t it. I just change oil and the cone o-ring before our vacation. I hope I didn’t screw it up.

  4. #4
    Tech Guru PWCToday.com Is My Home Away From Home Watercraft Magic's Avatar
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    Re: 98 XPL RPM drop

    Check your RAVEs. 6500 RPMs is what you get with 951s when the RAVEs aren't opening.
    email Chris at Watercraft Magic cdofixr1@live.com

  5. #5
    PWCToday Regular undertaker's Avatar
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    Re: 98 XPL RPM drop

    Grumpy was correct, the pump was full of water. So here is my next question for all of the seadoo guys;

    I put on a new impeller/driveshaft boot on the front of the impeller. I put a new o-ring in the back of the pump on the cone but left off the plastic cap that goes over the drive shaft boot. (Rookie) Would this allow the water to come in via the front of the impeller?
    What fluid do you all recommend using to fill the pump?

    Thanks!

  6. #6
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    Re: 98 XPL RPM drop

    Quote Originally Posted by Watercraft Magic View Post
    Check your RAVEs. 6500 RPMs is what you get with 951s when the RAVEs aren't opening.
    We did a check on the RAVEs. Well not me but Scotty Mac did. He said the RPMs dropped to 6000.

    Thanks!!

  7. #7
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 98 XPL RPM drop

    No on the cap on the prop cone....If you need a pump I got a nice big hub bronze one for $325 shipped. Came from a limited XP.

    Gear oil is fine.
    Last edited by Grumpy Old Guy; 07-31-2018 at 07:02 PM.

  8. #8
    PWCToday Regular undertaker's Avatar
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    Re: 98 XPL RPM drop

    Another dumb question; If the o-ring on the cone is new and the driveshaft seal is new and everything is tight, where can the water be coming in?

    Thank you!

  9. #9
    PWCToday.com Is My Home Away From Home Grumpy Old Guy's Avatar
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    Re: 98 XPL RPM drop

    Two places,either you didnt get the oring in right or the front seal is leaking.

  10. #10
    Tech Guru PWCToday.com Is My Home Away From Home Watercraft Magic's Avatar
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    Re: 98 XPL RPM drop

    Grumpy is correct. Barring any weird cracked pump housing or stripped 1/8" pipe plug thread scenarios of course.

    Either way, you should see if the pump oil cavity will hold 10 psi of pressure for 5 mins or so before adding any oil. But, usually, if it holds steady for 20 seconds even, it's a very good sign. We pressure test every* SeaDoo pump (that gets filled with oil) that we service or have apart for any reason.

    * don't quote me on that
    email Chris at Watercraft Magic cdofixr1@live.com

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