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Old 10-22-2013, 02:42 PM   #1
sjc56 OP
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Joined: Oct 2006
Location: Broad Brook CT USA
Oddometer: 1,037
XT350 1mm overbore

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.
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Old 10-22-2013, 02:53 PM   #2
oldxr
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Location: central komifornia
Oddometer: 999
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.
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Old 10-22-2013, 04:28 PM   #3
sjc56 OP
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No specs with the piston (Yamaha) I'll bring the new piston and rings with me.
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Old 10-23-2013, 02:26 PM   #4
sjc56 OP
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Dropped the cylinder and piston off at the machine shop, no big deal,$60.
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