CP Pistons brand Yamaha YZ450F 2003 - 2009 FULL RACE Project X forged Platinum piston kit For use in high performance and racing engines; for use with a standard size bore of 95mm; and stock stroke of 63.4mm; 13.5-1 compression ratio; Piston works with Carrillo connecting rod that is 2.5mm longer than stock. Project X series piston kit includes light weight piston; light weight piston pin; piston rings and pin lock rings. In addition to the standard features; this FULL RACE piston also includes coated piston skirts; dual pin oiling; broached oilers and lateral gas ports to provide improved ring seal and greater power. NOTE: This piston is for use ONLY with the matching CP Carrillo Platinum Kit connecting rod
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