41005-ZY1-625ZB Gear Nhb14m Case - Overview. The 41005-ZY1-625ZB Gear Nhb14m Case is a critical component within Honda marine engine systems. This gear case assembly specifically supports the outboard motor's lower unit by housing and protecting the gears that transmit power from the engine to the propeller, ensuring reliable mechanical motion and efficient power transfer. Engineered to match precise factory specifications, it ensures seamless integration with existing parts, maintaining optimal