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question?
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Posted by: 400ex18

my 250r is supost to be bored 60 over does anyone know wat mm the piston is??

Posted by: atvmxr

maybe 67.5mm? If the stock bore is 66mm, then .060" over is ~ 1.5mm = 67.5mm

**EDITED** to avoid confusion

Posted by: Qracer

Stock bore is 66mm so it would be 67.5mm

Posted by: 400ex18

thanks!!!!