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  1. #1
    VdeKock's Avatar
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    GP1300r middle piston seized...

    Today a friends GP1300 revved down on top speed, and was smart enough to stop directly..
    we took it to the beach and we checked the cylinders, and the middle one was low on compression.

    At home we took the head off and found a little hole/crack in the middle piston, there are 80hours on it right now
    and the previous owner already replaced some pistons... WE DID NOT KNOW.

    The back and middle Cylinders were 2 PROX A-pistons, and the front was still OEM.
    we are looking for a reason why this happend again...

    SKI has milled stock head and R&D M16 reeds, fuel controller and the rest of all standard mods.

    Some of you can tell by the look of the pistons and spark plugs what happened....


    My guess is that the prox A pistons where to small at the beginning.... Cylinder marks are 12-16-12


    pictures tel more then words

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  2. #2
    VdeKock's Avatar
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  3. #3
    VdeKock's Avatar
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    the middle spark plug is also a bit different than the rest,....i cant tell what this means

  4. #4
    Possibly an air leak somewhere? I'm thinking maybe rear main seal?

  5. #5
    Still running oil injection?

  6. #6
    Quote Originally Posted by skyline2962 View Post
    Possibly an air leak somewhere? I'm thinking maybe rear main seal?
    If the rear seals were leaking the rear cylinder would of went and not the middle one.

  7. #7
    VdeKock's Avatar
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    Quote Originally Posted by chris1200 View Post
    Still running oil injection?
    Yes the injection was still on, all lines where inplace.
    We are going to premix now.

    Click image for larger version. 

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  8. #8
    Wow the power valve must have dropped there!

  9. #9
    VdeKock's Avatar
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    Quote Originally Posted by chris1200 View Post
    Wow the power valve must have dropped there!
    No power valves, its a 2007 EFI

  10. #10
    Oh ok, nevermind... Have you serviced your injectors before? Flow measured?

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