90043-ZY6-030 Bolt 2, Stud (8X25) - Overview. The 90043-ZY6-030 Bolt 2, Stud (8X25) is a vital component in Honda marine engine systems. This stud bolt secures critical engine and marine components, ensuring the efficient and reliable operation of your watercraft. Engineered to exact Honda factory specifications, it guarantees a seamless fit and long-lasting durability. Its precise design supports the structural integrity of assemblies within the marine system, preventing leaks and mechanical fa