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  1. #1

    Rxp Motor In 15f Or Ultra 150??

    Has Anybody Tried Putting A Rxp Motor In A 15f Hull Or Ultra 150 Hull???? What Do U Guys Think?? Would One Be Better Than The Other. I Have 2 Ultra 150 Hulls And 2 15f Hulls-- So I Have Been Thinking????????????


  2. #2

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    Cool

    i'd go with 15f

    later cd

  3. #3

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    Isn't the 150 quite a bit smaller and lighter than the 15F?

  4. #4
    xxx2's Avatar
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    Yes, But the Stx-r Hull accelerates faster,Corners harder, and has a higher top speed than the 150 with same engine

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    I don't believe I'd tell that to anyone else.

  6. #6

    Kaw

    Dont the 150 ultra and 15F have different pumps? ie mixed flow vs. axial ?

    I would think the 150 ULTRA swap would be a big mistake . BIG. On the other hand, the 15F sounds very interesting.

  7. #7
    r33pwrd's Avatar
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    Go stxr hull! (or 15-f) the ultra has proven not to be a "fast" hull... your wasting your time on that one! The Stxr is one of the best handiling hulls avaliable (this is coming from a yamaha guy) I have all the stock parts to put your ultra back together! do that and just sell it to fund the RXP motor!

  8. #8
    way2fast's Avatar
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    Quote Originally Posted by xxx2 View Post
    Yes, But the Stx-r Hull accelerates faster,Corners harder, and has a higher top speed than the 150 with same engine

    The Ultra 150 is a few miles per hour FASTER top end, than the 3 seater STX-R, with like power, hull but the water has to be fairly calm.

    It's unlikely that the 4-tec engine would fit into the Ultra 150 hull...probably more like impossible. The Kawi 4 stroke is a tight fit in the 15-F and I would think the SD engine would also be, but it might be do-able.

    Richard

  9. #9
    xxx2's Avatar
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    I ride every week with 2 stx-r's (the wifes) and 2 ultra 150 (the guys), and by the end of the trip the guys on the 150's usually swap by the end of the trip cause the 3 seaters accelerate and are Faster topend, We ride on glass like rivers, 90% WOT, long distances. My experience is with me on the 150 WOT in superman, My friend can slowly pass me sitting upright on the 3 seater. we both swapped skii's...same results Every time BOTH of the Stxr's are faster than both of the Ultra 150's that I ride with...This is just my observations and findings.

  10. #10
    way2fast's Avatar
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    Your observations on the speed of the Ultra vs a STX-R really surprise me. I have a 1999 Ultra 150 and have never seen any STX-R that will keep up with it unless it has triple pipes. The STX hull is better on a bouy course, but in a straight line race it hasn't a chance (unless the Ultra is not running right).

    Richard

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