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How to figure displacement based on piston size (big bore)? Yamaha XT500

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Hello. 

Wondering if anyone can help me figure out what my current displacement would be after boring cylinder for larger piston. The engine is a Yamaha XT500, stock piston is 87mm, bored up next size to 88mm. Just wondering how that effects the displacement and what it would be considered in CC now? Please and thank you!

Edited by Super72

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1st over is not big bore. It will still be somewhat under a true 500cc

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Pi x the radius squared x height (stroke).

3.1416 x 19.36 (Centimeters) x 8.4 (centimeters) = 510.9 CC

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