41100-ZY6-715ZB Gear Nhb14m Case - Overview. The 41100-ZY6-715ZB Gear Nhb14m Case is an OEM marine engine part critical to Honda marine engine systems. This gear case serves as the protective housing for the gear mechanism, ensuring smooth and reliable power transmission within the lower unit of the engine. Designed to match factory specifications and dimensions, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Genuine OEM gear c