31223-ZW2-F01 Return Spring - Overview. The 31223-ZW2-F01 Return Spring is an essential component in Honda marine engine systems, primarily supporting the throttle or choke mechanisms. This genuine OEM spring is vital for returning mechanical parts to their original positions, ensuring smooth operation and preventing operational mishaps caused by improper component resetting. Its precise engineering ensures seamless integration with existing parts, maintaining optimal performance and durability.