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Wiseco Piston Kit for 2009-13 Yamaha YFM550F Grizzly - 92.00mm Cylinder - 40104M09200 1999 KTM 520 EXC 2008 Polaris Sportsman 800 HOWiseco Performance Piston Kit Part Number: 40104M09200 Piston Size: 92. 00mm These kits contain everything you need to complete your piston repair, the first time Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy. High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power. Each piston is built from race proven designs that are chosen by the top race teams in all