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Need fast answer on bore size

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So I'm going to rebuild my top end on my 79' Rm 125. The stock bore is 54mm but this kit (http://cgi.ebay.com/ebaymotors/Wiseco-Piston-Kit-Suzuki-RM125-77-80-54-5mm-_W0QQcmdZViewItemQQitemZ330439855446QQptZMotorcyclesQ5fPartsQ5fAccessories) Has a bore size of 54.5mm. Would i need to get the cylinder rebored or would this just give me a bigger compression piston? Thanks everyone.

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