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Thread: compression

  1. #1

    compression

    I just bought a compression gauge any tips on how to check it???


  2. #2
    ph2ocraft's Avatar
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    Another famous debate topic but here's how I do mine.
    I remove the plugs, hold the throttle wide open and crank 5 revolutions (I've tried cranking until the gauge stopped and generally see no difference) at each cylinder, recording the numbers.
    I've heard one reason for not checking one plug at a time is IF you have a cylinder that is lower or higher than another cylinder you will get a different cranking speed thus throwing your compression reading off.
    I couldn't imagine it would be much but you never know, I've never tried it.

  3. #3
    Take a look at this . I've tried it (leaving the other plugs in) and it works.

    http://www.groupk.com/tec-comp.htm

  4. #4
    ok will test it and let you know!
    I am having trouble with the carbs though. One cylendar is running really hard and hott and the others cold and soft. I looked at the tech articles but I dont know which screw is which.( High, Low. Etc.....) Any pics?? Slt 780 96'???

  5. #5
    Thanks for the link dorf

  6. #6
    Moderator beerdart's Avatar
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  7. #7
    ph2ocraft's Avatar
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    Is that with the boat running on a hose or in the water?
    Which cylinder is it?

  8. #8
    ok I checked the compression. Starting from the front of the ski and going back. 1st read around 100 second was 110 and 3rd was 130. I have picture of the plugs which were all pulled when I checked compression. They are in order from the front of the ski to the back and the picture of all three is front of the ski is left and so on. When I removed them the first had some smoke. the others were not. The first two are running soft and the back one is running hard and hott.
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  9. #9
    O and these pluggs are pretty new.

  10. #10
    I was running on a hose

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