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  1. #1

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    gp1200 65u stock compression?? what should it be???please help asap!!!

    i just borrowed a compression tester, i got th folling readings.. #1 130 #2 120 #3 130 why would the middle be off by 10 psi??? is this worth worrying about??? i want to get my head milled, to boost the compression, but im wondering if i need rings or worse pistons!!! the ski seems fast but i think it should be faster, im gonna hopefully borrow a friends gps so i can get a real mph # for everyone, and im dying to know!!!!
    if u know the stock compression #'s i would really appreciate the info!!!!! thanks guys have a great night!!!


  2. #2
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    125 across all 3, with a fully charged battery and the throttle held wide open. Your down slightly on #2 but within the wear limit. GO RIDE!

  3. #3
    run it !! thats ok

  4. #4

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    thanks you for the reply!!! i cant believe 39 views and only you replied... do u know what the wear limit is??

  5. #5
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Generally speaking a 15psi loss from perfect compression, you would start to notice a drop in performance. Also, its possible that when you did the compression test, the oring on the compression tester did not seal like it did on the other two cylinders. If you don't tighten enough, air gets by, it you tighten too much the oring will squeeze out on one side and air leaks by.

  6. #6
    Budman's Avatar
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    Its always a good idea to examine your oil lines. Make sure the line going to cylinder # two isn't leaking.

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