Why did my haojue 125 motorcycle stall? Urgent! Urgent!

Adjust the valve lash. If possible, grind it. It should be that the engine combustion transition is not good. After that, thoroughly clean the carburetor and air filter and replace them with new spark plugs. Then adjust the mixture ratio of carburetor according to the color of spark plug combustion, and adjust the spark plug gap, which is 0.6-0.8 mm under normal circumstances. When the throttle valve is closed quickly, the instantaneous mixture will be too thin. You can also add a throttle after receiving the oil, which can also alleviate this situation.