CP Pistons brand 2004-2008 Honda CRF250R FULL RACE trenched forged piston kit with bump pockets. For use in high performance and racing engines; for use with a standard size bore of 78mm; and stock stroke of 52.2mm; 14.5-1 compression ratio; kit includes top end gasket kit, 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. This part number piston includes bump pockets to boost compression further but these can ONLY be used with stock, or stock type concave valves. They can NOT be used with flat faced valves. Project X series Piston
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