16123-ZW9-013 Plunger Set - Overview. The 16123-ZW9-013 Plunger Set is a critical OEM component within the fuel system of Honda marine engines. This plunger set plays a vital role in maintaining accurate fuel delivery through the accelerator pump, supporting smooth and reliable engine operation. Designed with precise dimensions and materials to meet Honda's factory standards, it ensures seamless compatibility with existing hardware and fuel system components. Its robust OEM design helps maintain