35470-ZX2-013 Neutral Switch - Overview. The 35470-ZX2-013 Neutral Switch is an essential electronic safety component designed for Honda marine engine systems. It functions within the electronic control system to prevent engine starting unless the transmission is in neutral, helping to avoid accidental movement of the boat and ensuring operator safety. This important switch integrates seamlessly with Honda outboard engines, especially applicable to the Honda BF200, BF225, and BF250 series marine