41101-ZY3-C01ZD Gear Case NH565 - Overview. The 41101-ZY3-C01ZD Gear Case NH565 is a genuine Honda marine engine part designed specifically for the gear system within Honda marine engines. This Gear Case assembly plays a crucial role in housing and protecting the internal gears that transmit power from the engine to the propeller, ensuring reliable and efficient mechanical motion. Built to OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance an