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  1. #1

    Piston question?

    I broke a piston in my 2002 xlt 1200. I looked on a Yamaha website and they have 4 different pistons. They also say different colors(Red, Orange, Green, Purple) They all say (std). I assume they mean standard. So why 4 different numbers? They are different prices too. What is the difference? Thanks

    Last edited by pooner; 08-06-2009 at 12:48 PM. Reason: Added color

  2. #2
    Forgot to ask, can you reuse the gaskets? They are steel and seem to be re-usable. Thanks


  3. #3
    I'm assuming the different Colors represent bore over sizes...
    Last edited by YAMA CAT; 08-06-2009 at 03:00 PM. Reason: bad info

  4. #4
    CHICKA WAH WAH bren's Avatar
    Join Date
    Sep 2007
    Cairns, Australia
    79.90A - RED
    70.91B - ORANGE
    79.92C - GREEN
    79.93D - PURPLE

    these are all standard sizes for XL LTD (66V) engines depending on the factory bore / nikasil sizing.

  5. #5
    Thanks. How do you know which one you have? Should I just go with (A) to be on the safe side? The rings are standard. Thanks again.


  6. #6
    yamahank's Avatar
    Join Date
    Aug 2006
    Each cyl. is stamped on top.

  7. #7
    Cylinder size
    indication a Piston color mark
    0 ~ 5 Red
    6 ~ 10 Orange
    11 ~ 15 Green
    16 ~ 18 Purple

    Thanks everyone. I found this. They are stamped with a number.

    Should I just order new gaskets or just reuse the old ones?

  8. #8
    Its better to burn out than fade away christian79's Avatar
    Join Date
    Jul 2007
    Marysville Ohio
    Popular wisdom states that if the black coating is still on the gasket, apply at thin coat of grease and reuse. Of course you will also get the guys that say they replace them every time they take them off. It is a personal preference... However, for me with 3 skis.... I reuse!!!

    Good Luck

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