Js550 cylinder jug

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  1. #1
    PWCToday Newbie
    Join Date
    Sep 2017

    Js550 cylinder jug

    I have an '82 js550. I bought it and tore it down. There are a few not too bad scratches but since I'm this far torn down I want nice cylinder walls. It has been bored out to the point that I'm looking to replace the jug and I'm wondering are all PP550 jugs compatible? If not, What's compatible with my 82 motor?

  2. #2
    I dream skis sportsfreak29's Avatar
    Join Date
    Oct 2011
    Midland, Tx.

    Re: Js550 cylinder jug

    All JS 550 piston port cylinders are basically the same.
    Last edited by sportsfreak29; 11-10-2017 at 09:34 PM.
    If you're not crashing, then you're not trying!!!

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  3. #3
    PWCToday Regular delta rat's Avatar
    Join Date
    Oct 2012

    Re: Js550 cylinder jug

    There's a huge difference in porting between the 82-85 jugs and the 86-90 530a jugs which are labeled 530a above the intake. More aggressive porting on the 530a. Look for some later jugs that are still on their original or first bore. It not good to use 550 jugs past 1mm over.
    '78 js 440 superstock PJS 2400 pipe, pjs extended tank, skat 16
    '87 650sx handling mods, skat 15.5
    '89 550-650 40mm keihin, pipe mod, supertrapp, skat 17
    '90 550-750 (project) 750 SP, Coffman's pipe, Factory waterbox, RHASS 750 pump kit, Hooker 9/15

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