13011-ZH7-004 Ring Set (0.25) - Overview. The 13011-ZH7-004 Ring Set (0.25) is a genuine Honda piston ring set designed for use in Honda marine engine systems. This ring set supports the engine's piston system by providing a precise seal between the piston and cylinder wall, crucial for maintaining compression and engine efficiency. Manufactured to match factory specifications, this ring set ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Fe