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Wiseco Top-End Rebuild Kit for 1979-1991 Honda XR80R - 48.00mm - PK1277 2012 Polaris IQ Shift 550 with 121" Track 1990 Yamaha Exciter LE 570Wiseco Top End Rebuild Kit Part Number: PK1277 Piston Size: 48. 00mm Designed and built for each specific 4 stroke powersports engine Improved tensile strength of forged material optimizes strength and service life Dedicated forgings allow for optimized strength to weight ratio Includes high quality piston rings, wrist pin(s), and circlips All Piston Kits are precision crafted and forged in the USA Wiseco's complete Top End Piston Kits are offered for