Possible compression issue 96 GSX 787
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  1. #1
    PWCToday Newbie JMAN1's Avatar
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    Possible compression issue 96 GSX 787

    Hello all,

    I have this ski that I flooded on the hose(yeah yeah I know I'm an idiot) the engine was full past the carbs and unfortunately I couldn't work on it for two weeks as I was gone for my job. But when I got back I flipped the Ski upside down, drained the water and then used a combo of wd-40, seafoam, and isopropyl alcohol in it to remove any residual dampness and small amount of rust that may have built up. Today I cranked over the engine with the carbs, spark plugs, and exhaust removed in order to shoot all of that crap out. Then I hooked up a compression tester I borrowed from O'Reilly auto with everything still off and I got; 82 and 75 ish. So.. is it possible that the engine that was a great running rebuild by a shop this past spring actually is completely trashed from having water in it? And if so: how is that possible?

    Thanks guys,
    Jasper

  2. #2
    PWCToday.com Is My Home Away From Home john zigler's Avatar
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    Re: Possible compression issue 96 GSX 787

    If it sat that long with water in it, you are done. Rust has set in to the cyls, rings, and worse, crank bearings.
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  3. #3
    PWCToday Newbie JMAN1's Avatar
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    Re: Possible compression issue 96 GSX 787

    Can you explain why that is? As soon as I poured all the water out I put 3 different types of oxygen and moisture removing chemicals in theres and turned the motor over by hand until I was sure every MM of the interior was coated in the concoction... now say even if there was rust forming while it sat why would the amount that could have formed be detrimental to the engine? I understand some of the bearings and the cylinder walls becoming slightly scored by the rust after being dissolved by the chemicals. But enough so that the engine would be ruined? I just dont understand.

  4. #4

    Re: Possible compression issue 96 GSX 787

    yes.. the rings are stuck in place, and worse the crank bearings are pitted and will go and take out your bottom end.

    dude all you had to do is get it running the same day, and the motor would be saved...

    I have sunk plenty of skiis and it really sux but you can stop until it runs, and you can get it on the water and up to temps to get all the water out..

  5. #5
    PWCToday Newbie JMAN1's Avatar
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    Re: Possible compression issue 96 GSX 787

    I know, I know "had to get it running" there's only so many hours in the day and I've got a job to keep. But anyway;
    So would the rings being stuck in place cause the lose of compression I'm seeing? The engine has spun freely and easily by hand ever since pouring the water out.

  6. #6
    Top Dog wire4money's Avatar
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    Re: Possible compression issue 96 GSX 787

    Quote Originally Posted by JMAN1 View Post
    I know, I know "had to get it running" there's only so many hours in the day and I've got a job to keep. But anyway;
    So would the rings being stuck in place cause the lose of compression I'm seeing? The engine has spun freely and easily by hand ever since pouring the water out.
    Because it was immersed in water for two weeks

  7. #7
    PWCToday Newbie JMAN1's Avatar
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    Re: Possible compression issue 96 GSX 787

    Alright, thanks for that information. n: so does anyone actually know why?

  8. #8
    Resident Guru SpitAndDirt's Avatar
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    Re: Possible compression issue 96 GSX 787

    If you have nothing else to lose, try pouring a couple of tablespoons of vinegar in each spark plug hole. I would recommend bringing the crank to a position where both pistons are halfway between the stroke. The vinegar might be enough to break up a little surface corrosion that may have formed on the piston rings, thereby keeping compression from building. After maybe 24 hours, crank the engine with the plugs removed to blow out any remaining vinegar. Pour a small amount 2 stroke oil in the plug holes and retest compression.
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  9. #9
    PWCToday Regular Seadoos9694's Avatar
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    Re: Possible compression issue 96 GSX 787

    sounds like a bad day

  10. #10
    PWCToday.com Is My Home Away From Home kcr357's Avatar
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    Re: Possible compression issue 96 GSX 787

    Quote Originally Posted by JMAN1 View Post
    Alright, thanks for that information. n: so does anyone actually know why?
    Yes, read post #4.
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