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  1. #1
    Frequent Poster
    Join Date
    May 2013
    Location
    Olalla, WA
    Posts
    266

    Js 550 crank oring question

    Got the case split and replacing crank seals. Top end is still sealed up and I would like to avoid breaking it down if not nessasry.

    inner crank bearings have o-rings on them. They are a little bunged up and one has a chip/split in it. How important are these?

    Can the crank and pistons be lifted out the bottom end or do i need to split the top end?

    Will post pics later tonight. Old seals literally fell apart when i split the case. Crankseal journals are pretty. Asty too, and about a cup of black oil came out the flywheel cover.
    JS 550 85'
    JS 550 87'
    SX 300 91'
    X2 89'
    SL 650 Triple 92'

  2. #2
    Frequent Poster
    Join Date
    May 2013
    Location
    Olalla, WA
    Posts
    266

    Re: Js 550 crank oring question

    Oh and the middle bearing with the double o-rings can be moved around, is this one supposed to be tight to the crank?





















    JS 550 85'
    JS 550 87'
    SX 300 91'
    X2 89'
    SL 650 Triple 92'

  3. #3
    Resident Guru BigDawg's Avatar
    Join Date
    Feb 2006
    Location
    So.Cal.
    Posts
    1,008

    Re: Js 550 crank oring question

    Quote Originally Posted by PWCguy123 View Post
    Got the case split and replacing crank seals. Top end is still sealed up and I would like to avoid breaking it down if not nessasry.

    inner crank bearings have o-rings on them. They are a little bunged up and one has a chip/split in it. How important are these?

    Can the crank and pistons be lifted out the bottom end or do i need to split the top end?

    Will post pics later tonight. Old seals literally fell apart when i split the case. Crankseal journals are pretty. Asty too, and about a cup of black oil came out the flywheel cover.
    The best way to go through an engine is the right way. When corners are cut it can leave someone subject to taking an unexpected swim mid summer. IMHO, all seals, pistons, rings, gaskets and bearings should be replaced when overhauling an engine.
    Your engine looks like a good candidate.
    1975 JS400 WSAA - Modified
    1976 JS400 WSAA - Factory Unrestored Original
    1980 Clayton Jacobson Alien - One of 7 ever built
    1981 JS440 - WestCoast
    1982 JS550 - Yellow/Red
    1982 JS550 - Pro Mod
    1983 JS550 - Super Stock
    1987 JS550 - Cal tech Ski - "Fish"
    1988 JS550 - Low time - Like New
    1989 JS440SX - PJS Super Stock
    1989 JS550 - Stock with mild mods
    ___________
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