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  1. #1

    gp1200 head and cylinder marked 63m?

    is it possible or was i told wrong i know they should say 65u but was told that some 1200 were 63m? thanks... tony


  2. #2
    1131 Adam E.'s Avatar
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    Here is a discussion about 1100 v. 1200 exhaust. They are both marked the same but are different. Yamaha engineered these machines so close together.

    http://greenhulk.net/forums/showthre...light=63m+1200

    And here is the discussion about 1200 cylinders. Post #2 has the stamping information

    http://greenhulk.net/forums/showthre...light=63m+1200

  3. #3
    Moderator OsideBill's Avatar
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    This help confuse you even more
    Cylinders with 63M in casting, head cover with 63M in casting, Head 65U in casting all of them off my 99 GP1200
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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Name:	65U 111.jpg 
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Size:	2.82 MB 
ID:	183134  

  4. #4
    yup thats what mine look like. someone got lazy at yamaha or what!

  5. #5
    Moderator OsideBill's Avatar
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    Nope, the cases, cylinders and head cover are all from the 1100 platform. The only difference is a couple extra pulse line nipples in the cases, and the sleeves in the cylinder. Why spend all that money on new tooling?

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