Several common fault phenomena of motorcycle carburetors are: difficult starting, unstable idling, poor transition, insufficient power, oil leakage, and high fuel consumption. The above only selected the faults of the carburetor for analysis. But in fact, from the perspective of the whole machine, there are many factors that cause the above-mentioned failure phenomenon. Such as difficulty in starting: the disorder of the ignition system, the change of the spark plug electrode gap, etc. will cause difficulty in starting. Such as unstable idle speed: In order to reduce the sound of the engine cylinder head, the motorcycle factory often adjusts the engine valve clearance too small, which leads to the deterioration of the engine intake and exhaust state, and the idle speed is unstable or even no idle speed phenomenon. The user needs to analyze the fault condition of the vehicle in detail.