35470-ZY1-733 Neutral Switch - Overview. The 35470-ZY1-733 Neutral Switch is an essential safety device for Honda marine engine systems. It monitors and detects when the transmission is in the neutral position, allowing the engine to start or run only under safe conditions. This prevents accidental movement of the boat, enhancing safety for operators and passengers. Designed to integrate smoothly with Honda's transmission system, it ensures optimal performance and reliability.. Key Features. Gen