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  1. #1

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    GP1200R Crank Phase

    So I measured the distance from the spark plug surface to the pistons with the #1 piston at TDC. Here are my measurements: #1 1.430, #2 3.564, #3 4.160. #2 and #3 should be equal right? Efffff.


  2. #2
    Julian's Avatar
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    Should be equal, if you hand-turn the driveshaft ( remove sparks ) you can check if there's any loose rod connection ( noises )

  3. #3
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    some versions might be the 3rd has a different hight cant rember for sure but just for shts and giggles put 3 at top dead and ck 1 and 2

  4. #4
    Robsauto2's Avatar
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    With the head off, put #2 at TDC, then measure 1 and 3, both should be exactly the same. I chased a loss of rpm and speed until I found my crank twisted.

  5. #5
    Robsauto2's Avatar
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    Quote Originally Posted by Rocketman View Post
    some versions might be the 3rd has a different hight cant rember for sure but just for shts and giggles put 3 at top dead and ck 1 and 2

    Yep, the EFI skis have a slightly bigger combustion chamber in cyl 3.

  6. #6

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    No matter which cylinder is at TDC, the other 2 are never equal. This explains all my problems. See the thread titled "help with gp1200r" for my problems if interested.

  7. #7

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    When I got the ski it had been sitting a while. There was water on the #1 spark plug and a little rust on the crank under the #1 cylinder. The crank wasn't moving but I freed it up with wd40 and by rotating the shaft by hand. I guess it sucked up water and this caused the crank to twist?

  8. #8
    Robsauto2's Avatar
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    Quote Originally Posted by jrchandler View Post
    When I got the ski it had been sitting a while. There was water on the #1 spark plug and a little rust on the crank under the #1 cylinder. The crank wasn't moving but I freed it up with wd40 and by rotating the shaft by hand. I guess it sucked up water and this caused the crank to twist?
    Yes when 1 cylinder hydro-locks it will twist it.

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