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  1. #1

    Join Date
    Jun 2008
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    Greece
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    10

    Ultra 250x '08 : Low boost & rpm

    My kawi (Ultra 250x '0 has riva plate, riva free air-filter, riva free riva exhaust, riva sponsons, tbm scoop, r&d anti-cavitation cone, and impeller skat-trak 13/19.
    ..After the last service(55hours) my kawi has lost acceleration and top speed(54mph)!! It can not reach more than 7-8psi in the boost meter and it has dificulty to overtake 7100rpm but outside the water it works normaly.
    In the last service I changed sparks, oil, oil filter, sc belt and sc oil and I installed skat-trak 13/19 SK557520SW1319 and r&d anti-cavitation cone.
    I already checked oil level, belt, sparks, fuel quality and sc.
    Is the problem in the impeller or in the anti-cavitation cone or anything else?



  2. #2
    GODOSIDIS's Avatar
    Join Date
    May 2007
    Location
    Greece
    Posts
    735
    If you cant raise boost and u say that belt is ok then it must be the BOV.
    Also Skat will slow you down in a stock ski.
    Pming u my mobile....

  3. #3
    nicjak's Avatar
    Join Date
    Mar 2008
    Location
    Warragul, Downunder
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    7,794
    +1
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    kind of points to the prop dont you think

  4. #4
    Offshore Aussie's Avatar
    Join Date
    Jan 2010
    Location
    South East Australia
    Posts
    550
    Why did you choose a ST 13/19? Just curious to know your goal.

  5. #5

    Join Date
    Feb 2010
    Location
    ausralia
    Posts
    44
    hi petros let us know when u find out u problom l just put a skat prop 12/19 in my ski l was going to take it for a run this weekend. see if l have the same problom...!

  6. #6

    Join Date
    Jun 2008
    Location
    Greece
    Posts
    10
    hi dobbo, i will change the skat trak 13/19 with oem impeller and i will check the jet on sunday. I will inform you about the result.
    I hope the problem to be the impeller!!!!

  7. #7

    Join Date
    Jun 2008
    Location
    Greece
    Posts
    10
    Hi, O.A., i installed the skat trak 13/19 impeller because i heard that i could earn in acceleration with almost the same top speed!!

  8. #8

    Join Date
    Dec 2009
    Location
    SE Asia
    Posts
    370
    +1
    3

    Potential SC problem

    I had same problem.

    But mine had a slight increase in rpms every time we turned right. Was using a Block off plate then.

    Could not figure it out until the SC seized. A bolt came thru the front cover of the SC and made a great big whole. Had to replace the SC.

    Dealer said it was SC bolt loose !

    Best is you bring it back to your dealer to check the SC if that is possible.

    Will try to figure out how to include image here for all to view.

  9. #9

    Join Date
    Jun 2008
    Location
    Greece
    Posts
    10
    Thank guys,

    I found the problem!!
    When I replaced the Skat-trak 13/19 impeller with O.E.M. impeller the problem is solved!!!

  10. #10
    dreww's Avatar
    Join Date
    May 2007
    Location
    G.P.
    Posts
    182
    good call. too much prop for your mods. keep it around for later

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