HELP! 91 650sx
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Thread: HELP! 91 650sx

  1. #1
    PWCToday Newbie
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    HELP! 91 650sx

    I just got a 91 Kawi Js650xs from my neighbor and I have some work to do. I got it started and it idles fine but after that, it's not doing so well. I'll be making another post shortly but wanted to introduce myself.

    If anyone can help me, I'm not sure what's going on in this thing. I have the hull number and number on the engine. Can someone help ID what exactly I have here?

    Hull # KAW62073H091

    ENGINE # JF650AE118784

    Is this an 84 engine in my 91 hull? Is it stock? I have no idea.

  2. #2
    PWCToday.com Is My Home Away From Home
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    Re: HELP! 91 650sx

    Considering that Kawasaki introduced the 650 PWC engine in 1986, I don't think it's a 1984 engine. The last two digits of the engine serial number don't correspond to the year.
    Riding mostly Lake Austin

    1984 JS440 -- 1989 650sx -- 1991 X2 -- 1992 750sx -- 1995 900zxi (qty 2) -- 1995 X2

    Quote Originally Posted by cujo View Post
    God intended PWC to be two strokes, as well as dirt bikes, snowmobiles, and chain saws....

  3. #3
    PWCToday Newbie
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    Re: HELP! 91 650sx

    Quote Originally Posted by linkman View Post
    Considering that Kawasaki introduced the 650 PWC engine in 1986, I don't think it's a 1984 engine. The last two digits of the engine serial number don't correspond to the year.
    Oh, I didn't know that. Awesome, thanks man

  4. #4
    PWCToday.com Is My Home Away From Home PrickofMisery's Avatar
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    Re: HELP! 91 650sx

    If your engine is period correct is should be silver in color and have a 38mm Keihin. This combo was carried out through the remaining years of production.

    FWIW - 1991 was also the first year of rear exhaust. Welcome to the site.
    Last edited by PrickofMisery; 06-20-2018 at 08:42 PM.

  5. #5
    PWCToday Newbie
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    Re: HELP! 91 650sx

    It is silver but it has a Mikuni 44 on it. Also has a JetSport exhaust (blue in color don't know if that helps). I got the engine torn out last night and basically stripped the engine bay and cleaned it really well. Going to be doing a top end rebuild, carb rebuild (maybe buy new), new fuel lines, new exhaust hoses, and lots of tiding up and making it clean inside for the water this year. This winter I want to tear it apart and re-paint it and put some hydroturf all around.

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