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  1. #1
    David 1 FAST VE's Avatar
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    Odd Wear Ring Problem on 99XP Ltd Help me help my buddy!

    He has a 99XP with the 951 of course.
    Problem is that he burned up a wear ring. He said he was just ridding along and lost performance all of a sudden. Upon checking things out he found that the wear rind was toast.
    He ordered new bearings and seals and rebuilt the pump with OEM parts I think.
    New wear ring from SBT.
    Started it up with WD40 sprayed on it and it ate up the new ring.
    It does it in the same place both times, from 2:00 to say 7:00.
    Looking in from the back clearance looks good all around except it is touching in that spot.
    It didn't wear away and leave a good clearance it just keeps eating away.
    I pulled on the motor mounts and didn't feel anything loose.
    Here is a pic of the damage both rings look exactly alike.

    I have not done two stokes in years and not much on the 951 XP.
    So can someone help?
    Could the pump just warp?
    Is there something in the driveline that can do it, the bearing in back feels good?

    Any ideas?

    Thanks

    David
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  2. #2
    RumRunnerRon's Avatar
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    I have heard plastic pumps can warp but don't know what that can cause. It does sound possible. Maybe you did not get the holes drilled deep enough on the new ring and when putting the screws in it caused the ring to push in making contact.

  3. #3
    David 1 FAST VE's Avatar
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    It is a bronze pump, but I will ask about the screw.
    Only thing it did it on the ring that was there already out of nowhere and if you can see in the pic the screw hole is on the top opposite of the burn spot.

  4. #4
    been around the block Stagesrt4's Avatar
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    So u replaced thrust bearing or driveshaft needle bearing?

    Thrust requires oil n needle requires grease if u didn't do that...

  5. #5
    David 1 FAST VE's Avatar
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    Dont know which he did but a very capable person did it for him and he said on the bench it turned perfectly.
    It was the thrust bearing I am pretty sure, dont think he did anything to the drive shaft other than pulling on the shaft and he said he felt no play.

    Lots of us are at a loss on this?

  6. #6
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    the ears on the pump might need some shimming, when the pump is off and you spin it, it will spin fine but when you torque it down its twisting it.

  7. #7
    David 1 FAST VE's Avatar
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    Quote Originally Posted by ultramaxracing05 View Post
    the ears on the pump might need some shimming, when the pump is off and you spin it, it will spin fine but when you torque it down its twisting it.
    I think that is what is happening. He said that it just happend all of a sudden.
    He thought a new ring would fix it and it did the same thing.

    It sounds like a reassonable idea but why would the problem just arise after all these years and then the pump need shimming out of the blue any idea?

    I will try to get the info on wether or not it turns freely on the bench.

    David

  8. #8
    Work Harder, Millions on Wellfare Depend On Us! ultramaxracing05's Avatar
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    its just hard to explain. I had this problem on my xpl. but the pump was binding on something, you have to make sure it goes nice and easy. Turn the driveshaft while installing the pump so you know its in place. if you are carefull when tightening you should feel the pump start to warp.
    after the 4 nuts are tight shine a light through the back and see where it touches, loosen what ever nut needs to be loosen and shine the light again. you will see and improvement, and just shim that part of the ear.

  9. #9
    SURFnTURF's Avatar
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    Your pump shoe hasn't been shimmed correctly against the hull and that is causing the pump to warp.You can try shimming the pump against the shoe but it isn't the correct procedure because when you shim the pump it misaligns the pump to the hull . It is a pain to fix the shoe but a better option imo.

  10. #10
    David 1 FAST VE's Avatar
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    Quote Originally Posted by SURFnTURF View Post
    Your pump shoe hasn't been shimmed correctly against the hull and that is causing the pump to warp.You can try shimming the pump against the shoe but it isn't the correct procedure because when you shim the pump it misaligns the pump to the hull . It is a pain to fix the shoe but a better option imo.
    But how could it just get off?
    It has never been removed and the ski has never seen any major work at all.
    It was purchased from speed4sale years ago and for those that known him Nick keeps his stuff perfect. There have been two owners since and all they have done is basic maintenance and put gas in it.
    This problem just came out of nowhere while riding and first thought was a pump build and wear ring but that didn't do it.

    Could the pump just warp while riding, or ride shoe move a little after all these years?

    Keep the ideas coming and thanks guys for the input!


    David

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