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ilpadrino113
03-14-2006, 10:40 AM
how many cc's would boring a .020 over on an 85.50 mm bore give a 400ex?
GPracer2500
03-14-2006, 11:06 AM
85mm piston is 397cc
86mm piston is 406cc

So, I *think* a 85.5mm piston would give you 401.5cc.
underpowered
03-14-2006, 11:08 AM
Originally posted by GPracer2500
85mm piston is 397cc
86mm piston is 406cc

So, I *think* a 85.5mm piston would give you 401.5cc.

yup, 401.7ml is pretty close to what you would have.