J.E. Pistons 391920 FSR Pro Series Piston Kit - Standard Bore 78.00mm, 14.5:1 Compression body-guards-accessories-a-arm-boot-guards 1998-2000 Arctic Cat ZR 440

1998-2000 Arctic Cat ZR 440 Sno Pro

Intake Duration (degrees): 216

or stock muffler

1993-2002 Yamaha YZ250

J.E. Pistons 391920 FSR Pro Series Piston Kit - Standard Bore 78.00mm, 14.5:1 Compression body-guards-accessories-a-arm-boot-guards 1998-2000 Arctic Cat ZR 440Bore: 78. 00mm Compression: 14. 5: 1 Compression Sizing: Standard Bore As the leader in forged racing pistons, JE Pistons has applied over 75 years of experience to its carefully developed line of premium forged pistons for UTV engines. Engineered, forged and machined 100% in the USA, JE Pistons are designed for each specific engine and use application to provide the ultimate combination of durability and performance. Covering all popular models like