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Wiseco Top-End Rebuild Kit for 1982-90 Yamaha RZ350 - 65.50mm - PK137 2001 Moto Guzzi California Jackal 1997 Polaris Indy XCFWiseco Performance Top End Rebuild Kit Part Number: PK137 Piston Size: 65. 50mm 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