90004-ZY1-003 Set Screw - Overview. The 90004-ZY1-003 Set Screw is an essential component in Honda marine engine systems. This part plays a critical role in securing other components within the engine assembly, ensuring reliable mechanical fastening and system integrity. Designed specifically for Honda marine engines, this set screw maintains the operational stability and longevity of your marine equipment by holding parts firmly in place. With precise threading and a hexagonal socket head, it s