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  1. #1
    superair's Avatar
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    ultra 250X engine surge and RPM tops at 5300

    Hey everyone, I have a 2007 Ultra 250X that I recently purchased. I just changed the oil and plugs, my son was riding it and after about a 30 minute cruise he stopped me on another craft and said that it would not go over 33 MPH on the dreamometer. I rode it and it will not reach more than 5300 RPM's and the engine has a bad surge on top. Also there is very little power when accelerating. I changed the plugs again and put fresh gas in it. Does anybody have any idea on why it is not going higher than it is? I measured the amount of oil I extracted and replaced maybe only a 1/2 pint more than I pulled out. This is still in the marks for the level though.

    Any help is appreciated.

    Matt


  2. #2
    Formerly Ultra250 TN Aquaholic6801's Avatar
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    Need a lil more info... how many hours, was it flipped?.....belt tight? ....check the intercooler hoses? ........

  3. #3
    superair's Avatar
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    The craft has 29 hours on it. The belt is tight. It has not been flipped, but he did submarine it by pulling the reverse lever while going too fast in forward. He rode it about 30 minutes afterwords while we were on our ride when he started to loose power. I will check the hoses tomorrow.

    thanks,
    Matt

    Quote Originally Posted by Ultra250 Tn View Post
    Need a lil more info... how many hours, was it flipped?.....belt tight? ....check the intercooler hoses? ........

  4. #4
    benjahw benjahw's Avatar
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    check the big hose on intercooler and supercharger. those pop off and lose your boost.

  5. #5
    superair's Avatar
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    Thanks, Guys. The large hose from the supercharger had the clamp closest to the supercharger come off. I took the hose out washed it with soap and water then replaced the clamp with a T bolt clamp. The outside of the hose had a oily residue and was very slick. This of course solved all the issues.

    Matt

  6. #6
    Formerly Ultra250 TN Aquaholic6801's Avatar
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