90604-ZV5-791 Circlip (Inner) - Overview. The 90604-ZV5-791 Circlip (Inner) is an essential component used in Honda marine engine systems. This circlip functions primarily within the power trim-tilt and other related marine assemblies to provide reliable retention and secure positioning of internal parts. By maintaining secure integration with other internal components, it helps ensure smooth mechanical operation and prevents disassembly or unwanted movement under stress and vibration conditions