16406-ZVT-900 Throttle Body Guard - Overview. The 16406-ZVT-900 Throttle Body Guard is a critical component of the Honda marine engine fuel system. Its primary role is to protect the throttle body from debris, physical damage, and environmental exposure, which helps maintain the smooth and efficient operation of the engine. Crafted as a genuine OEM part, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Protects the throttle body