41100-ZVL-800ZA Gear Case *NH565* - Overview. The 41100-ZVL-800ZA Gear Case *NH565* is an essential component in Honda marine engine systems, specifically designed for gear housing with counter rotation and a distinctive Grand Prix White finish. This part plays a crucial role in protecting and housing the gears that are vital for transferring mechanical power within the marine propulsion system. Meticulously crafted to OEM factory specifications, this gear case ensures seamless integration with