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  1. #1
    PWCToday Newbie
    Join Date
    Sep 2017
    Location
    Indiana
    Age
    53
    Posts
    15

    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
    Location
    Midland, Tx.
    Posts
    544

    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!!!

    '84 js550/650 Hull, Tubbies, Footholds, 650sx Motor & Pump, 1.75 over 663cc's, OP Comp Head 190psi, 44SBN, Vortex FA, WC Intake, Boyesen Reeds w/ Stuffers, Factory B Pipe, Factory Waterbox, 650 Side Exhaust, Dual Cooling, Billet Couplers, Jet Works FCV, OP 650sx Ride Plate, PJS Top Loader, Skat 9-17, -2" AM Pole, MSD total loss. 54mph.

    Special thanks to Chris Newmiller, and Mitchell at M&M Marine!

  3. #3
    PWCToday Regular delta rat's Avatar
    Join Date
    Oct 2012
    Location
    California
    Posts
    53

    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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