The maintenance method of Haojue carburetor in March is that it can be disassembled and cleaned carefully. Clean the inside with carburetor cleaner and gasoline, and dredge all spray holes of carburetor with compressed air from air pump or pump. Check whether there are problems with the mixing ratio, oil level, oil needle, vacuum membrane, spring and electric damper of the carburetor, whether the air filter element is soaked in oil or blocked, whether the negative pressure fuel tank switch is faulty, whether the spark plug is faulty, whether the high-voltage electricity is cut off, whether the gasoline is faulty, etc. Most of these problems are that the scooter can't add the accelerator, especially the carburetor is blocked.