CP Pistons brand Yamaha YFZ450 ATV forged piston kit. For use in high performance and racing engines; for use with a +2mm big bore of 97mm; and stock stroke of 62mm 2003-05 or 63.4mm 2006-2014 ; 12.5-1 compression 2003-05 or 12.75-1 2006-2014 ; kit includes light weight piston; light weight piston pin; piston rings and pin lock rings.
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