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  1. #1
    Moderator RX951's Avatar
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    Lightbulb YAMAHA OEM to PRO-X Size comparison GP1200R

    OEM GP1200R

    Red: 79.899 ~ 79.902 (3.1456 ~ 3.1457)
    Orange: 79.903 ~ 79.906 (3.1458 ~ 3.1459)
    Green: 79.907 ~ 79.910 (3.1459 ~ 3.1461)
    Purple: 79.911 ~ 79.914 (3.1461 ~ 3.1462)

    1-5 cylinder gets an A piston
    6-10 cylinders gets a B piston
    11-15 cylinders gets a C piston
    16-20 cylinders gets a D piston

    In Pro-X 7170

    Red = A
    Orange = B
    Green = C
    Purple = D


    Pro-X piston kits can also be listed by other retailers as part numbers

    24-7170A----Lynn Vick Products Pro-X kits
    7170A-------LA-Sleeve Pro-X Kits
    7170PX-A----RIVA (Yamaha Pro-X Kits)


  2. #2
    spud's Avatar
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    Thanks Billie,

    That spells it out.

  3. #3
    Moderator RX951's Avatar
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    I run 1-size smaller piston for the hole on my ski......

  4. #4
    spud's Avatar
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    Interesting. I have a brand new PRO-X A piston and it feels tight (skirt area in the top of the bore) in the 0 and the 10 cylinder. The used pistons a PRO-X C feels much looser in the cylinders. The piston skirts must collapse in with wear. A good reason to break the ski in a little before hammering it.

  5. #5
    Moderator OsideBill's Avatar
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    Spud,
    If you mic the used piston you will definetly see some collapse on the skirts. There is a thread on pwctoday by Harry that covers this in detail. I have mics in my garage up to 12" I think I have your range covered let me know if you need them to measure.

    OsideBill

  6. #6
    Quote Originally Posted by RX951
    I run 1-size smaller piston for the hole on my ski......
    That's the same thing your wife says Billy

  7. #7
    Moderator RX951's Avatar
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    Quote Originally Posted by VOODOO
    That's the same thing your wife says Billy
    ...........hA-hA......... Steve ! Actually, you can call me Tripod




  8. #8
    Greenhulk Grasshopah (DRC) HallPass's Avatar
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    so should i run a size smaller?

  9. #9
    Moderator RX951's Avatar
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    Quote Originally Posted by HallPass View Post
    so should i run a size smaller?
    no, for a stock application, run the size the piston stamping calls for when you crossreference.
    If it calls for a A run and A, and so on....

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