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  1. #1

    Compression test

    Ive made a comp test and only get 100psi on all pistons!?
    Is that bad ?
    Maybe it depends on the gauge?
    Its no difference between the 3 cylinders... same number for all.. 100psi
    Have around 80hours on the ski...

    Yamaha gp1200r -02


  2. #2
    Ya Boy Trevor bajaeater's Avatar
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    thats not good. do you have aftermarket heads? all three are same thats good and i could be wrong but your gauge maybe wrong. those are low numbers

  3. #3
    WATER WOODY's Avatar
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    What guage you using? A cheap guage can give false readings.Whats your elevation?Stock heads or aftermarket?

  4. #4
    sleeplessnMS's Avatar
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    Id say the gauge is inacurate all 3 cylinders are the same I wouldnt worry bout it! Sounds like its in good shape.

  5. #5
    WE DONT DIAL 911 RDH's Avatar
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    get a better gauge and make damn sure before you go out.... just because there the same in readings doesnt mean its all good, could be all 3 sets of rings are jacked evenly.

  6. #6
    mrbtd's Avatar
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    HOw are you doing the test ? Are you holding the throttle open ? Is the battery good and charged ?

    If you are getting the same for all three there is hope.

  7. #7
    WAVEATER WAVEATER's Avatar
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    Do a compression test on another engine in an A.T.V. or something (2 stroke) that you know is good and see what your gauge reads. get someone else's gauge for a second comparison. i check mine once in awhile on a new motor after break in as i know what the motor should read and that tells me if my gauge is still reading accurately.

  8. #8
    westy's Avatar
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    Quote Originally Posted by mrbtd View Post
    HOw are you doing the test ? Are you holding the throttle open ? Is the battery good and charged ?

    If you are getting the same for all three there is hope.
    this is my first thought the throttle is getting held open??

  9. #9
    cmherrera's Avatar
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    Snap On gauge will work good.

  10. #10
    The throttle is not open.. iam going to check the battery.
    Head is stock... everything is stock=)
    The gauge was pretty cheap.. only 30$
    I will test it for another ski this week... that is in good shape

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