650sx popup pressure
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  1. #1
    PWCToday Newbie DudeWithAJet's Avatar
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    650sx popup pressure

    Recently got a 1989 650sx and took it out on the water and it wouldn’t really want to get up on a plane, measured the popup pressure and it was close to 40 psi. Do you think this would lead to not enough power to get on a plane? Is there any way I can turn down the popup without buying a new spring or rebuild kit.
    Last edited by DudeWithAJet; 08-27-2021 at 04:00 PM.

  2. #2
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 650sx popup pressure

    Quote Originally Posted by DudeWithAJet View Post
    measured the popup pressure and it was close to 40 psi. Do you think this would lead to not enough power to get on a plane?
    No.

    Do you have a jet ski trailer? If so you can test it while it is on the trailer.

    If the engine just doesn't want to make rpm, look for an exhaust or
    fuel leak.

    How does it run with the hood off?

    Is the tray vibrating while riding it ? that is a sign of cavitation.


    Bill M.
    Last edited by wmazz; 08-28-2021 at 12:52 AM.
    Horsepower == Speed, RPM != Speed



  3. #3
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    Re: 650sx popup pressure

    If you have the stock keihin carb they all have high pop off 35-45 psi or something. Don't quote me on numbers.

    For a mikuni that is super high. You'd want to be in the 18-24 psi range with an aftermarket flame arrestor

  4. #4
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx popup pressure

    Doesn’t want to climb up in rpm’s. Checked for exhaust leak and didn’t see anything. It seems to run the same with and without the hood on it on the trailer. It’s pretty rough on the trailer. Even on the trailer it bogs when trying to rev it.

  5. #5
    PWCToday Newbie DudeWithAJet's Avatar
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    Re: 650sx popup pressure

    The carb is the stock keihin, thanks for your input.

  6. #6
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: 650sx popup pressure

    Quote Originally Posted by SkiMan104 View Post

    For a mikuni (35 - 45psi) that is super high.

    You'd want to be in the 18-24 psi range with an aftermarket flame arrestor
    Sorry, but that is just bad info from a bad source.


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



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