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Wiseco Top-End Rebuild Kit for 1987-07 Yamaha YFZ350 Banshee - 64.00mm - PK139 1999 Yamaha XTZ600 1989-02 Polaris 500 ClassicWiseco Performance Top End Rebuild Kit Part Number: PK139 Piston Size: 64. 00mm These kits contain everything you need to complete your rebuild the right way, the first time High Performance ring kit and alloy pin included with each piston kit for extended life and sustained power. Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy. All Piston Kits are precision crafted and forged in the USA Wiseco's complete Top