CP Pistons brand Yamaha 2009 - 2013 YZF R1 forged piston and gasket set. For use in high performance and racing engines; for use with a 78mm standard bore; and stock stroke of 52.2mm; 998cc engine; 13.5:1 compression ratio; set includes 4 pistons; wrist pins; piston rings; pin lock rings and gaskets
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