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Complete, ready to bolt on, bore kit from Athena of Italy. Increased bore size from the stock 66mm to 69mm for increased performance. Compresion ratio is also bumped up from 11.7:1 stock to 12.2:1. Complete bore kit includes Athena aluminum cylinder with nickel-carbide coating, high quality forged 69mm piston kit and complete top-end gasket kit.
Stock CRF150R - 66.0mm bore, 43.7mm stroke
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