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Vertex Top-End Piston Kit for 1998-2001 Kawasaki KX250 - 66.36mm - VTK22521B 2003 Gas Gas TXT250 2014 Polaris RZR 800 SVertex Top End Piston Kit Part Number: VTK22521B Compression Ratio: STD Cylinder Diameter: 66. 40 mm Piston Diameter: 66. 36 mm Displacement: 250. 00 cc All pistons are heat treated with a T 5 hardening and tempering cycle All piston skirts are coated with a high tech Molybdenum Disulphite coating for faster break in time and increased piston life Forged High Compression pistons improve power and torque across entire rpm range Top end piston kit