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Athena P400210100067 Big Bore Cylinder Kit (289cc) - 4.00mm Oversize to 82.00mm, 13.7:1 Compression luggage-tank-bags Regenerative synthetic polymer system resistsBore: 82. 00mm Sizing: Sizing Not Available Kits include aluminum cylinder with nickel carbide coating designed with larger water jackets. Includes Forged piston, rings, clips and pin. Athena top end gasket set includes required seals and hardware. Easy to follow step by step installation instructions. Most are bolt on; no machining required except where noted. Vehicle Fitment: 2018 2024 Honda CRF250R 2019 2024 Honda CRF250RX