41101-ZY6-020ZD Gear *NH565* Case - Overview. The 41101-ZY6-020ZD Gear *NH565* Case is an authentic OEM component designed specifically for Honda marine engine systems. This case plays a crucial role in housing and protecting the internal gears in the marine transmission system, ensuring reliability and smooth mechanical operation. Precisely engineered to fit factory specifications, it guarantees seamless integration with existing parts, maintaining optimal performance and durability.. Key Featu