99 SXI Pro bogs on low adjustment - Page 3
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  1. #21
    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: 99 SXI Pro bogs on low adjustment

    I am betting on a bad CDi
    Quote Originally Posted by Firebird A/C&Heating View Post
    OMG.....Rules for 550 vintage ski class...550 ski riders do not conform to any kind of rules. That is why you are riding a 550 ski in the first place. Rules suck....
    PS...the rule book will be in my 550 pump
    Quote Originally Posted by WB1994
    Listen , stop your cryin' , its only an X2.

  2. #22
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    Re: 99 SXI Pro bogs on low adjustment

    I pulled the temperature sensor and I can’t get an omh reading.

  3. #23
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 99 SXI Pro bogs on low adjustment

    Quote Originally Posted by 9gardners@centurylink.net View Post
    I really think it is a carb problem due to the fact that it only starts when I prime it.
    You need to prime the carbs because the needle and seats will not open when
    you crank the engine over.

    Either you have a vacuum leak, or the engine is not producing the normal amount
    of manifold vacuum.

    Quote Originally Posted by 9gardners@centurylink.net View Post
    Ok turned the low adjustment screws out to 1 1/2, stock is 1/2. This seems a little excessive but it is
    idling and runs. Seems a little rough and has hesitation on the low side..
    That confirms a problem. Opening the low screws allow more vacuum to reach the
    float diaphragm.

    Did you reuse any of the gaskets? Did you keep the aluminum plates that raise the
    carbs up? With your new engine, there is the potential of vacuum leaks on the main
    seals (if they were stuffed full of grease during assembly) or lack of vacuum because
    the cylinders were bored sloppy loose.

    But most of the time, the leaks are under the carbs, or at the reed cages.


    Bill M.

    Atmospheric pressure opens the needle and seat. Since atmospheric pressure remains
    relatively constant, any loss of manifold vacuum effects starting.

    Another possibility is the lever inside the carb is adjusted below the casting.
    (In this case the spring preload is increased, or the needles are barely opening)

    On tear down, look for wet gaskets. Wet gaskets are the result of a vacuum leak.
    Unless you drip gas on them.
    Last edited by wmazz; 08-30-2018 at 04:00 AM.
    Horsepower == Speed, RPM != Speed



  4. #24
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 99 SXI Pro bogs on low adjustment

    oops!
    Last edited by wmazz; 08-30-2018 at 04:10 AM.
    Horsepower == Speed, RPM != Speed



  5. #25
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 99 SXI Pro bogs on low adjustment

    Quote Originally Posted by 9gardners@centurylink.net View Post
    New needle and seat 1.5 stock. Stock brown spring pop off is 30 psi.
    Pop-off is low, maybe it is your tester, but it should be close to 38psi.

    You are close to 32psi (1.5 seat and 65gr) Do you have an FPP pipe?

    Why did you replace the other engine?


    Bill M.
    Horsepower == Speed, RPM != Speed



  6. #26
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    Re: 99 SXI Pro bogs on low adjustment

    It starts with the needles open further and runs but is rough like the spark is week.

  7. #27
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    Re: 99 SXI Pro bogs on low adjustment

    Tested the rectifier and numbers did not match the manual. Going to replace the rectifier. Any aftermarket suggestions?

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