16123-ZY1-013 Plunger Set - Overview. The 16123-ZY1-013 Plunger Set is a genuine OEM component integral to the fuel delivery system of Honda marine engine systems. It plays a crucial role in regulating the accelerator pump mechanism to ensure proper fuel flow for optimal engine operation. Designed specifically to maintain the performance and reliability of Honda marine engines, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Thi