Yamaha - Nozzle, main - 7CR-1495S-6B-00Yamaha Main Nozzle Carburetor Fuel Metering Component 7CR 1495S 6B 00 Overview Main nozzles are one of those small parts that can completely change how an engine runs. Ive seen engines struggle under load or feel flat on the top end just because the nozzle wasnt right anymore. When its clean and properly sized, the motor pulls strong and stays consistent through the throttle range. Its a simple piece, but it plays a big role in how the engine performs