40226-ZY3-010 L Idol Port Seal - Overview. The 40226-ZY3-010 L Idol Port Seal is a crucial OEM component designed for Honda marine engine systems. It functions within the fuel and idle control system, providing a precise seal around the left idle port. This seal plays an essential role in preventing leaks, ensuring consistent idle speed, and safeguarding the operational efficiency of your marine engine. Its design ensures seamless integration with existing parts, maintaining optimal performance