Athena's Big Bore Cylinder Kits are composed by a cylinder with larger diameter, a piston kit and all the gaskets necessary for installation. Athena's Cylinder Kits are based on a solid know-how, born from years of experience, that made Athena the equipment supplier for many motorcycle manufacturers. This is why Athena is able to design and produce in-house cylinders and cylinder kits of the highest quality and efficiency, at an extremely competitive price.