13011-ZY9-010 Ring Set (0.25) - Overview. The 13011-ZY9-010 Ring Set (0.25) is a high-quality piston ring set designed specifically for Honda marine engine systems. Engineered to provide a 0.25mm oversize fit, this set ensures a tighter seal within the cylinder, significantly improving the compression and overall efficiency of your engine. Suitable for piston rings system, it plays an essential role in maintaining reliable engine performance and durability by preventing combustion gases from esc