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  1. #1

    My 250X loosing top speed in heat

    I have both an Ultra 250X and an 07 RXP.

    I purchased both about 2 months ago. Earlier this season my Ultra ran 67 on a GPS. The RXP ran 68.5. The ultra was much quicker out the gate.

    The Ultra now runs 65 (in the heat.) The RXP however runs the same. Both ski's are stock. Everything on the Ultra is good. The correct oil level, impeller look great; it just doesn't run well in the heat. On the cooler days it will run a little better. The RXP dosen't seem to be effected by the heat.

    The Ultra's seem to be picky in heat. Some days it feels great others kinda sluggish. It would be nice to see the temps after the inter-cooler. The inter-cooler may not be performing well and could use some help.


  2. #2
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Clean intercooler?

  3. #3
    I have not. Good point, the ski was overfilled from the dealer. I have corrected this but, it may have some oil or traces of. It can't hurt so I will do this and do some more testing.

    I really enjoy the ski. I would like it to be a little faster then my RXP. Everybody on the water wants a piece of it. I would just like it to be faster then my RXP for the simple fact I hear $hit from others when it is not.

  4. #4
    insist on only racing in chop

  5. #5
    Silence! I Keel You! earthshaker's Avatar
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    Quote Originally Posted by forrestsb View Post
    insist on only racing in chop

  6. #6
    I agree but everybody wants to run on glass.

    I would like to drill them on any condition. I am installing my wedge, Group K ride plate and clean the inter-cooler before my next test run. I hope this will help. If not I will get a power intake system and an exhaust bypass kit. Later when the after market catches up I hope to get more fuel and pulley it down for more boost.

    I just wonder if the injectors can flow more fuel? If not I will need larger injectors an adjustable blow off valve and CPU remapping. I see these motors making crazy power on ZX-14's. I know they can take more power we just need the fuel system to accommodate the mods.

  7. #7

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    it would be nice to see your findings after you install the groupk plate. take some points of reference after each part install so you know what did what.

  8. #8
    GDM's Avatar
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    Quote Originally Posted by tckylem View Post
    I see these motors making crazy power on ZX-14's.

    from what i was told and from what i have read , i thought the zx14 motor was completely different from the ultra 250 motor

    is it ?


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  9. #9
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Its actually based on the zx 12 motor.

  10. #10
    GDM's Avatar
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    Quote Originally Posted by Ultra250 Tn View Post
    Its actually based on the zx 12 motor.

    thats what i thought . my goofy friend argued with me for hours . me saying it was based off the zx 12 , him saying it was based off the zx 14

    he was calling kawi dealers and the doofs answering the phone were telling him it was based off the zx 14 .

    once he called riva and the clueless kid who answered the phone told him the ultra motor was the same as the zx14 he took it as fact

    the same doofs who answer the phone at riva also tried to sell me thier sponsons to pick up the top speed of my ultra 250



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