90005-ZV1-000 Reverse Lock Nut - Overview. The 90005-ZV1-000 Reverse Lock Nut is a specialized fastener designed specifically for Honda marine engine systems. It plays a pivotal role within the reverse gear system, ensuring that mechanical connections remain securely locked during operation. By providing precise fastening, this nut helps maintain the reliable and safe functioning of critical reverse mechanisms on Honda marine engines. Manufactured to meet exact OEM specifications, it ensures sea