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  1. #1

    compression test polaris 780

    I got 125 psi in all three cylinders. I'm seeing 140'a on you tube. The motor I got looks brand new from to to bottom 34 hours on it. Is this low and did I just buy a used up jet ski? I didn't charge the battery but it still has enough cranking to start it.


  2. #2
    BlueFishCrisis's Avatar
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    Good battery, throttle wide open, all plugs out, make sure the cylinders are wet, maybe a little fogging oil in them. Ideal is 140. Make sure you have a good screw in type gauge, not the push in rubber type.

    You should see between 130-140, but 125 does not make it "bad".

  3. #3
    I did what you said, and the compression came up 130 rear two 135 front. Thanks for the help

  4. #4
    BlueFishCrisis's Avatar
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    Good deal!

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