90012-ZZ5-M01 Bolt - Overview. The 90012-ZZ5-M01 Bolt is a crucial component in Honda marine engine systems. It primarily functions as a timing belt adjusting spring bolt, ensuring correct tension and secure placement within the engine assembly. This bolt supports the timing system, contributing to maintaining reliable engine operation and smooth mechanical motion. Designed to exact Honda factory specifications, it ensures seamless integration with existing parts, maintaining optimal performance