Athena Big Bore Sport Cylinder Kit (47,6 mm; 70 cc; Pin 10 mm). Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets. Forged piston with molybdenum coating. All are bolt-on; no machining required. NEW in original retail package.We are an authorized Athena dealer. All items in our store are 100% BRAND NEW and genuine. Hours of Operation Orders are processed by our warehouse Monday through Friday. Be sure to open your order immediately upon receipt to check for accuracy. All tags must be attached, retail packaging must be sealed and in brand new condition, and item must not have been worn, used or installed.