90741-ZW9-000 Special (16x13) Key - Overview. The 90741-ZW9-000 Special (16x13) Key is an original equipment manufacturer (OEM) component designed specifically for Honda marine engine systems. This small yet crucial key plays a specialized role in securing mechanical components within the Honda marine engine assembly. Precision engineered to the factory specifications of Honda's marine systems, it ensures seamless integration with existing parts, maintaining optimal performance and durability..