The motorcycle won't start.

Check and adjust carburetor, valve clearance and spark plug clearance. If necessary, the gap can be reduced and the mixture can be thickened. You can also raise the oil needle of the throttle valve by one grid to check whether the choke valve works normally. Don't send it back to the throttle handle immediately after the cold car starts. Check the ignition spark intensity. If the high voltage spark is obviously too weak, please check the ignition system. It's best not to twist the throttle when starting. If you have feet to start, you can pull the throttle and step on a few feet before opening the key door.

There is a "beep" sound in the exhaust pipe, which may be the sound of shooting. May be inhaled too much gasoline, spark plug water. Check whether the spark plug is wet and black. You can change a spark plug and check whether the ignition system and spark are strong enough. If the ignition spark is obviously too weak, the combustible mixture in the engine cannot be ignited. There is water in gasoline, too. Try changing gasoline. Water in engine oil can also lead to exhaust pipe slapping, and the water-vapor ratio is high.