17398-ZY6-000 Spring - Overview. The 17398-ZY6-000 Spring is a crucial component in the Honda marine engine system, specifically supporting the muffler duct grommet assembly. Its primary role is to provide consistent tension and allow precise controlled movement within the muffler duct system, which is essential for maintaining proper exhaust flow and system integrity in marine engines. This spring ensures seamless integration with existing parts, maintaining optimal performance and durability..