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  1. #1
    srjrinc's Avatar
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    Heavily modified gpr 1200 piston situation

    First of all, thanks to those who advised me to just tear down this ski from my prevous post!!!
    GPR 1200 on pre-mix with head, triple pipes, Novi's, Skat pump ect. to much to list.
    PSI @ 170 on 1 & 2 , # 3 was at 110. This is what I found, what do you guys think?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  2. #2
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    That's a gp1200r? What triple pipes?

  3. #3
    srjrinc's Avatar
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    Enlighten me! Dick

  4. #4

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    Like looking in a mirror...my engine compartment looks just like that. Speedwerx pipes are awesome! It's hard to tell from the pictures since my laptop sucks but is part of the piston sheared off and the rings are sticking out? How is the rear cylinder? Any places that you can catch your fingernail on?

  5. #5
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    The pic here is the #3 piston.....its not sheared off, its ...........very hard to explain.
    Looks like a combination of melted & as if it were sand blasted off.

  6. #6
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    what kind of fuel are you running with 170 compression. that is some extreme heat on the exhaust side. Also no piston wash at all.

  7. #7

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    Quote Originally Posted by JIM'S PERFORMANCE View Post
    what kind of fuel are you running with 170 compression. that is some extreme heat on the exhaust side. Also no piston wash at all.
    Jim's right...this was my next question. With 170lbs. you must be using the race gas domes since my pump gas domes give my speedwerx ported 1200 140psi in all 3.

  8. #8
    srjrinc's Avatar
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    I was using 91, with Castol racing pre-mix.

  9. #9
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by srjrinc View Post
    I was using 91, with Castol racing pre-mix.
    By looking at that piston i would say higher octane and more fuel needed.


  10. #10
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    wow. I'm running Novi's. 105 or 110 octane?

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