Yamaha Main Nozzle 7WG-1495A-7B-00. Overview. The Yamaha Main Nozzle 7WG-1495A-7B-00 is a genuine original equipment manufacturer component designed to precisely regulate fuel flow within the carburetor system. This nozzle plays a critical role in delivering the correct fuel volume needed for efficient combustion and consistent engine performance.. Built to Yamaha's strict engineering standards, this main nozzle ensures accurate fuel metering and a secure fit. It is an ideal replacement for clog