50151-ZY3-003 Rubber (Upper) Mnt - Overview. The 50151-ZY3-003 Rubber (Upper) Mount is a vital part of Honda marine engine systems. Specifically engineered for use in Honda outboards, this component functions as an upper mounting rubber isolator that absorbs and dampens vibrations within the mounting system. By doing so, it enhances operational smoothness and reduces mechanical stress on the marine engine assembly. Designed to precise factory specifications, it ensures seamless integration with