87121-ZVM-010 Rr (175) Mark - Overview. The 87121-ZVM-010 Rr (175) Mark is a genuine Honda marine engine part designed to support the identification system of the engine, particularly suited for the 175 MARK series. This rear mark is an important component within Honda marine engine systems, providing clear labeling and identification that aids in proper engine recognition and maintenance. As an OEM part, it ensures seamless integration with existing parts, maintaining optimal performance and du