question? [Archive] - ATV Riders Forum

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400ex18

11-11-2007, 10:26 PM

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

atvmxr

11-12-2007, 07:35 AM

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

**EDITED** to avoid confusion ;)

Qracer

11-12-2007, 08:05 AM

Stock bore is 66mm so it would be 67.5mm

400ex18

11-12-2007, 01:26 PM

thanks!!!!