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Thread: RPM's & Boost

  1. #1
    07 Ultra 250x - Blue/Silver justice25's Avatar
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    Question RPM's & Boost

    Have an 07 Ultra with 30 hrs on it. Dealer did service at 27hrs. RPM's are around 7600 and boost is at 10 on guage. This is my first ski and I was wondering if these are normal numbers for this ski. It just does not feel as strong as I thought it should, but I have not GPS'd it. Checked Oil and have no GI. I ride on the Lake here in TN and weather is high 80's with average humidity. Dreamometer stays around 58-60 (have not GPS'd it), but I think I will this Weekend.


  2. #2
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    7600 RPMs is a little low and boost should be a little over 11.....

    I would order a BOV block off and install, see if that brings the boost and RPMs up.......

  3. #3
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by Ultra250 Tn View Post
    7600 RPMs is a little low and boost should be a little over 11.....

    I would order a BOV block off and install, see if that brings the boost and RPMs up.......
    Also check over all clamps, hoses, etc.

  4. #4
    SE TX Rider's Avatar
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    I am getting the same numbers here (most of the time, higher) in southeast tx. My first WOT i get around 7700 RPM's then they drop to 7650, then down to a little over 7500. Water temp, and humidity kill RPM's. IMO, I think you are OK. Just make sure you check the RPM's on your 1st WOT, and let us know what it says. You can do the IC mod which would help keep your RPM's up throughout the day.
    Last edited by SE TX Rider; 09-04-2008 at 12:08 PM.

  5. #5
    07 Ultra 250x - Blue/Silver justice25's Avatar
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    will do, where is the thread on the IC mod?

  6. #6
    07 Ultra 250x - Blue/Silver justice25's Avatar
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    se tx rider, I dont know, but I am sure that the conditions are probably worst for you, here water temp is in the 65-75 range at the highest and heat is in the 80's with average humidity, so I do not think it is the weather for me I feel something is wrong, but I just ordered the B.O.V. kit, will give that a try and will prob. do the IC Mod. By the way, is the IC Mod reversable for warranty issues?

  7. #7
    SE TX Rider's Avatar
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    Quote Originally Posted by justice25 View Post
    se tx rider, I dont know, but I am sure that the conditions are probably worst for you, here water temp is in the 65-75 range at the highest and heat is in the 80's with average humidity, so I do not think it is the weather for me I feel something is wrong, but I just ordered the B.O.V. kit, will give that a try and will prob. do the IC Mod. By the way, is the IC Mod reversable for warranty issues?
    From what I've read, the dealer will not even see the IC mod, since it is a very simple mod.

  8. #8
    07 Ultra 250x - Blue/Silver justice25's Avatar
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    How big of a bennifit is this mod and do you think it with the B.O.V will help my RPM, Boost.

  9. #9
    Dubz1's Avatar
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    Quote Originally Posted by SE TX Rider View Post
    From what I've read, the dealer will not even see the IC mod, since it is a very simple mod.
    Are you sure about that? I think they would recognize hoses routed a different way, with Brass "T's" that are not OEM, and a plugged up exhaust. But what do I know.

  10. #10
    07 Ultra 250x - Blue/Silver justice25's Avatar
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    Can you tell me more about the timing mod, or where the thread is.

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