41100-ZY6-615ZD Gear *Nh565* Case - Overview. The 41100-ZY6-615ZD Gear *Nh565* Case is a critical component of Honda marine engine systems. It serves as the gearcase housing that encases the gears and drive shaft within the lower unit assembly, ensuring smooth mechanical motion and protection for vital transmission components. Designed specifically for Honda's marine applications, it supports the functionality and reliability of the lower unit system. Crafted with precision to meet factory speci