50519-ZVD-000 Reverse Lock Spring - Overview. The 50519-ZVD-000 Reverse Lock Spring is a crucial component within Honda marine engine systems, specifically designed to support the reverse gear mechanism in Honda Active Marine transmissions. It plays a vital role in maintaining tension that reliably engages and holds the reverse gear, ensuring smooth and safe operation while boating. Crafted with precision, this spring guarantees seamless integration with existing parts, preserving optimal system