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  1. #1
    ULTRA 250XXX's Avatar
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    Exclamation Ultra 250x With R&d Stage 1,with Pulley 1.1

    Hi,

    I have the stage 1 from r&d,.. the acceleration is amazing but the top speed is only 68-69mph..Fuel pressure regulator is at 37psi. I supose to be in the 73mph with this kit. Can somebody let me know why that happened. For you to have an idea how my boat run, I raced this weekend with a stock RXT-X and I won by 2 to 3 boats in front and my boat keep going on top end....Is that ok ....


  2. #2
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by ULTRA 250XXX View Post
    Hi,

    I have the stage 1 from r&d,.. the acceleration is amazing but the top speed is only 68-69mph..Fuel pressure regulator is at 37psi. I supose to be in the 73mph with this kit. Can somebody let me know why that happened. For you to have an idea how my boat run, I raced this weekend with a stock RXT-X and I won by 2 to 3 boats in front and my boat keep going on top end....Is that ok ....
    Any other mods done to the ski?

  3. #3
    ULTRA 250XXX's Avatar
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    Quote Originally Posted by BluUltra250x View Post
    Any other mods done to the ski?
    No other modifications...

  4. #4
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by ULTRA 250XXX View Post
    No other modifications...
    Hmmm What was your GPS #'s before the R&D kit?

  5. #5
    ULTRA 250XXX's Avatar
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    Quote Originally Posted by BluUltra250x View Post
    Hmmm What was your GPS #'s before the R&D kit?
    First I installed the ride plate,intake grate,power filter, freeflow exhaust with all these I was in 69mph... after I installed the fuel system and the pulley and intercooler kit it was 71-72 with full tank of gas....then I installed the crancase ventilation kit is at 68-69mph on gps

  6. #6
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by ULTRA 250XXX View Post
    First I installed the ride plate,intake grate,power filter, freeflow exhaust with all these I was in 69mph... after I installed the fuel system and the pulley and intercooler kit it was 71-72 with full tank of gas....then I installed the crancase ventilation kit is at 68-69mph on gps
    I know whats wrong!!!!! Did you replace your exhaust gaskets? I bet you didn't... Did you reuse them?

  7. #7
    ULTRA 250XXX's Avatar
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    Quote Originally Posted by BluUltra250x View Post
    I know whats wrong!!!!! Did you replace your exhaust gaskets? I bet you didn't... Did you reuse them?
    I didn`t took off the exhaust...

  8. #8
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by ULTRA 250XXX View Post
    I didn`t took off the exhaust...
    Damn, you must have small hands. When you ride the ski and let it sit for a little bit. When you start it back up, Does it idle rough and goes away?

  9. #9
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    it's probably a loose coupler or gasket

  10. #10
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by Region8Ultra250X View Post
    it's probably a loose coupler or gasket
    I agree.. I'm thinking something to do with the exhaust..

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