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big bore reccomendation

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Whats the best quality big bore kit for a DRZ400S? I want the biggest size without stroking. 450? Best place to buy? I want to do the bore, cams and E gasket all at once.

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athena,millimium technologies,luke racing.its best not to go over 435cc's on the stock bore(4mm bigger)there have been issues with head gaskets going any bigger

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