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  1. #1

    prox piston-what size

    What size (B,C or D) of prox piston should I use with Gp1200r cylinder-stamped 18? Cylinder has about 50 hours.
    thanks for advice !


  2. #2
    Duke's Avatar
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    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)


    As posted by RX 951 ( Billy )

    Here is the thread-

    http://greenhulk.net/forums/showthre...ht=piston+size

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