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Thread: Y-1, Y-2 ?

  1. #1

    Y-1, Y-2 ?

    what are the differences between the cylinders on the 1300?
    number 3 is cast Y-1, and number 1 and 2 are cast Y-2...
    anyone know?


  2. #2
    KamikazeGPR's Avatar
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    Andy, here is something i came across on net. Apparently, y-1,y-2 and so on are the cast #'s from the molds that the cylinders are made from. Probably just a time date thing. Here's a link...http://www.maxrules.com/fixyamahapowerhead.html

  3. #3
    Moderator OsideBill's Avatar
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    Cavity ID of the molds used for casting

  4. #4
    Thank you gentlemen...

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