The low-pressure nozzle controls the amount of fuel entering the engine when operating at lower speeds. It regulates the air-fuel mixture under low engine power demands. Regulating this mixture is important for smooth and efficient engine operation under various riding conditions. To maintain your motorcycle's low-pressure nozzle, use good-quality gasoline, regularly clean the carburetor, and keep the air and fuel filters clean. The low-pressure nozzle is that small, key component for great adventures on the open road.