90031-ZW5-010 Tensioner Bolt - Overview. The 90031-ZW5-010 Tensioner Bolt is a critical component of Honda marine engine systems. Specifically designed for the belt drive assembly, this bolt secures the tensioner, helping maintain proper belt tension to ensure reliable engine performance. Crafted to OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Specialized OEM tensioner bolt designed for Honda marine engine