87121-ZW6-B00 RR Mark - Overview. The 87121-ZW6-B00 RR Mark is an essential decal component that supports Honda marine engine systems. This specific marking plays a crucial role in labeling and identifying particular engine models or features, helping boat owners and service personnel maintain proper records and service procedures. As a genuine OEM part, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Official Honda OEM rear mar