41100-ZY6-615ZB Gear Nhb14m Case - Overview. The 41100-ZY6-615ZB Gear Nhb14m Case is an essential component within Honda marine engine systems. This gear case assembly houses and protects the internal gears that transmit power from the engine to the propeller, playing a crucial role in ensuring smooth mechanical motion and efficient power transfer. Designed for seamless integration, it maintains optimal performance and durability in the lower unit assembly.. Key Features. This genuine OEM gear c