Piston Kit Yz125Lc A For Big Bore S4C05800001APiston Kit for Athena Big Bore Cylinder 2 Stroke2 stroke cast piston for Athena big bore cylinder High resistance to mechanical thermal stresses Made with cutting edge CNC machining tools that ensures dimensional tolerances of less than 0. 01 mm Has been tested on engine dynamometer benches under progressive stress load, and thereafter on track to validate it performance even in the most extreme conditions The rings adapt to the cylinder liner even at