Yamaha Athena YZ125 144cc 58mm Big Bore Cylinder Phathead version 1998-2000 and 2001-2021 CR500 9cc (105+ octane) This model does not CR125R9302 CR85 big bore kit Chamber selection:K31 5.3cc Stock compression
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Ships within 48 hours · Estimated delivery Oct 4 - Oct 9