41100-Zx2-C21Zd Gear Nh565 Case - Overview. The 41100-ZX2-C21ZD Gear NH565 Case is a crucial component of Honda marine engine systems, specifically designed as a gear case assembly for outboard motors. It supports the lower unit system by housing gears responsible for transmitting power to the propeller, enabling efficient propulsion. Crafted to meet exact factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. G