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oversize piston?

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ive found that my piston on my o3rm250 is 1.10mm over and was wondering what size does that make my bike is it 255cc or 260cc just curious if you know the specs as bore sizes increase cc wise thanks and do i need to put my piston in dry or lube it with premix??

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std cc is 249.

The +1.10mm bore that is now 67.50mm adds a little less than 4cc

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put some premix or wd40 inside the cylinder when putting in that new piston. let us know how she runs after that.

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right on thanks for the info ,got my gaskets today my piston will be in tomorrow i hope ill let ya know how she gets together,pat c

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