CP Pistons brand Yamaha YZ250F 2005 - 2013 FULL RACE Project X forged Platinum piston kit For use in high performance and racing engines; for use with a standard size bore of 77mm; and stock stroke of 53.6mm; 250cc engine; 14-1 compression ratio; Piston uses a pin that is 1mm smaller than stock and works with Carrillo connecting rod that is 2mm 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 cpya2515ca03761n
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