Athena Garelli SR 50 Bore 47.6mm Bore Pin 10mm Bore Flat Head Piston Big Bore Cylinder Kit w/Head

The Athena Big Bore Ø 476 mm Pin 10 mm Flat Head P400485100089 Cylinder & Piston Kit is designed to enhance the performance of air-cooled vertical Yamaha-Minarelli engines, commonly found in applications like MBK Booster, Yamaha BW’s, and Aprilia SR. This kit is engineered with advanced technical solutions, including redesigned intake and exhaust ports, a CNC machined fifth port for increased gas flow, and a patented fixing system that reduces thermal expansion. The flat-head piston is specifically designed to optimize inlet flow, ensuring better lubrication and increased power and torque. The cylinder is made from high-silicon aluminum alloy with a Nikasil coating for durability and heat dissipation.