XT350 1mm overbore

Discussion in 'The Garage' started by sjc56, Oct 22, 2013.

  1. sjc56

    sjc56 Long timer

    Joined:
    Oct 26, 2006
    Oddometer:
    1,424
    Location:
    Broad Brook CT USA
    The new piston arrived today, I went with the second overbore of 1mm. Someone know the bore size for the second overbore? My Clymer just gives the stock bore specs of 85.97-86.02, and the second over size of piston size of 86.50 but not the bore needed. Will the machine shop know? first time doing this.
    __________________
    #1
  2. oldxr

    oldxr Long timer

    Joined:
    Jan 28, 2007
    Oddometer:
    1,155
    Location:
    central komifornia
    You take the piston and cylinder to the machine shop.The machine shop measures the piston and bores the cylinder for it+needed running clearence.The running clearence spec will usually be on a slip of paper packaged with the piston or if a factory oem piston in the fsm.
    #2
  3. sjc56

    sjc56 Long timer

    Joined:
    Oct 26, 2006
    Oddometer:
    1,424
    Location:
    Broad Brook CT USA
    No specs with the piston (Yamaha) I'll bring the new piston and rings with me.
    #3
  4. sjc56

    sjc56 Long timer

    Joined:
    Oct 26, 2006
    Oddometer:
    1,424
    Location:
    Broad Brook CT USA
    Dropped the cylinder and piston off at the machine shop, no big deal,$60.
    #4