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  1. #1
    sltx1050's Avatar
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    picking up a 89 js440

    im thinking about picking up a 89 js440 that starts and runs good what a acceptable for compression?
    i plan on testing it when i get there but the guy said it getting 115-120 on both cylinders is that good?


  2. #2
    steve45's Avatar
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    Hell, if you find one that runs you're probably doing good! How much is he asking for it?

  3. #3
    sltx1050's Avatar
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    well i ended up picking it up last friday and it has 120 and 122psi on the cylinders and runs great, ive put about 10 hours on it already!
    and i picked it up for $400 with a cart

  4. #4
    Bushy260's Avatar
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    I know this is an old thread (almost 3 years ago), but may help others in their quest for information about these units.
    I just completed a compression test on a 1990 JS440-A14 at 120 psi, with throttle closed.... new head gasket installed today and waiting on the gasket sealant to set, due to heavy pitting and other gashes, so yet to perform another test again, due to dead battery after replacement.
    New test will be done with throttle open, as I forgot that requirement (again).
    Based on YouTube videos, these are suppose to be up around 150 psi, but your Jet Ski seems to be happy at 120 psi as well.
    Based on your comments, I'd be inclined to say anything between 120-150 psi is a good deal.
    Will know more tomorrow, and hope it helps somebody else who is wondering.
    Just in case, recommended torque for the head, from another site, was 18 foot pounds.... done in increments of 14' lbs, then 16' lbs and finally stopping at 18' lbs...
    Cheers.
    Boating is not a matter of life and death.... it's more important than that...
    Daryl

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