16734-ZY3-000 Plate Stay - Overview. The 16734-ZY3-000 Plate Stay is a vital component used within Honda marine engine systems, specifically supporting the rigging and accessory mechanisms. Its primary role is to provide structural support and stability, ensuring that connected parts remain securely in place to maintain smooth and reliable engine operation. By reinforcing the assembly, it helps prevent misalignment or damage under operational stresses, contributing to the longevity and optimal f