Kawasaki JS 550 sx rebuild
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  1. #1
    PWCToday Guru
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    Kawasaki JS 550 sx rebuild

    I just picked up a 1990 550sx with low compression in owner cylinder. Previous owner stated they had overheat problems prior to letting it sit in storage. I tore into the motor and the pistons and cylinders don’t look awful but I noticed the head has been milled. I don’t want to run this head again because it looks like it was milled too much. I have a nice 440 head and wondering if I could run this head on it?
    thanks in advance
    Last edited by Pbois334; 07-06-2022 at 06:01 AM.

  2. #2
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: Kawasaki JS 550 sx rebuild

    440 head is a no go combustion chambers are way too small, I have some good stock 550 heads if you need one.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  3. #3
    PWCToday Guru
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    Re: Kawasaki JS 550 sx rebuild

    I have a used set of pistons and cylinder that were removed from a running ski years ago. The crosshatch is still visible in the cylinder. Wondering if I should hone the cylinder or would I be good to go as is?

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