50518-ZW9-000 Reverse Lock Arm - Overview. The 50518-ZW9-000 Reverse Lock Arm is an essential component of Honda marine engine systems, specifically designed to support the reverse gear system. This component plays a crucial role in securing the engine in reverse, allowing for precise maneuverability and safe operation of your marine engine. Engineered to fit perfectly within the system, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Fea