Yamaha Main Nozzle 7RK-1495N-6B-00. Overview. The Yamaha Main Nozzle 7RK-1495N-6B-00 is a genuine original equipment manufacturer component designed to regulate fuel flow within the carburetor system. This main nozzle plays a crucial role in delivering the correct amount of fuel into the air stream, ensuring proper combustion and consistent engine performance.. Engineered to Yamaha's exact specifications, this component provides a precise fit and dependable operation. It is an ideal replacement