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320 majesty

iommajesty
in Yamaha

Featured Replies

  • Author

standard 320 bore is 80mm

Looks like i have been ripped off i have just got one that is 74mm

  • Quote

    Standard 250 bore is 70mm and max oversize is 72mm, so not sure what that piston is from. All of the YZ, DT etc share the same bore/stroke as the TY so it isn't from one of those. Could be a jet ski or snowmobile piston?

    The 270cc Majesty kits that are on sale are 72mm pistons which is only the same as max oversize which actually gives 260cc, not 270cc. The 74mm piston will give about 275cc.

  • Quote
    • Author

    Problem solved my digital vernier is faulty measured it with a mechanical one and it is 80mm thanks for the help

  • Quote

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