90004-ZY9-M00 Stud (6X40) Bolt - Overview. The 90004-ZY9-M00 Stud (6X40) Bolt is an essential fastener used in Honda marine engine systems. This stud bolt is specifically designed to support various assembly points in the engine, providing secure and reliable fastening that ensures all components stay properly aligned and tightened during operation. Manufactured to exact OEM specifications, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key