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  1. #1

    300x Impeller/Pump ?

    HI all
    Newb hear so sorry in advance if I posted in the wrong section.
    My 2013 300x jet pump bearings collapsed and the impeller locked/jammed up against the pump housing wear ring and the ski stopped Instantly.
    I fitted new genuine bearings and seals and cleaned up the impeller.
    After assembling the pump I checked the impeller clearance and it was the maximum allowable clearance , so I thought I'd fit it back up and test it thinking if the clearance was to loose that it would probably rev a litter higher from cavitation.
    To my surprise it would only rev to 7400 rpm where prior to the pump bearings collapsing it would rev to 7800/7900 rpm.
    The bearings and impeller all assembled perfectly and all was torqued to spec.

    So I was hoping someone could tell me why its lost its top end rpms ?

    Thanks in advance


  2. #2
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    Last edited by stgnsw; 01-18-2020 at 08:20 PM.

  3. #3
    Take the time to smile sirbreaksalot's Avatar
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    Before you rode the ski did you check to see if in the process of the pump failure. it' hasnt take out your engine.?
    1st thing before you run the engine again check to see if you have any / excess crank float...
    Then we will worry about your low rpms
    Last edited by sirbreaksalot; 01-18-2020 at 10:25 PM.

  4. #4
    Quote Originally Posted by sirbreaksalot View Post
    Before you rode the ski did you check to see if in the process of the pump failure. it' hasnt take out your engine.?
    1st thing before you run the engine again check to see if you have any / excess crank float...
    Then we will worry about your low rpms
    Hi sirbreaksalot

    Thanks for your reply, I will check the crankshaft end play.

    What I have noticed is that it actually goes faster at 3/4 throttle.

    At full throttle it would rev to 7400rpms and at 3/4 throttle it would rev to 7600rpms
    It feels like the engine is taking up at full throttle.

    I have changed spark plugs twice,
    I have swapped the supercharger belt.
    Ski still ran the same.

    I cleaned the intercooler and it picked up
    200 rpms but still with the same issue.
    Now 7600rpms full throttle
    and 7800rpms 3/4 throttle.


    I will check the crankshaft end play.

  5. #5
    The end float seems ok.
    It doesn't seem to excessive.
    I tried measuring the difference by putting feeler gauges In there,its about
    .127mm
    Last edited by stgnsw; 03-15-2020 at 03:21 AM.

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