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Vertex Top-End Piston Kit for 1987-06 Yamaha YFZ350 Banshee - 64.95mm - VTK22568100 2001 Arctic Cat ZL 550 2004 Suzuki RM-Z250Vertex Top End Piston Kit Part Number: VTK22568100 OEM Top End Piston Repair Kit Manufactured with High Quality Forging and Vertex's MSO2 Coating Vertex Piston Kit and Top End Gasket Kit in one complete Top End Repair Made in the USA Vertex's cast two stroke and forged four stroke pistons are designed for longer life, less noise and more power. Each piston is coated with Vertex's MOS2 (Molybdenum Disulphide), which aids in break in and adds to