Jincheng Suzuki GX 125 is driving at high speed. If the clutch is released, the engine will stall.

This is a common problem of cars. When your engine is running at high speed, the carburetor supplies a lot of fuel. Suddenly release the throttle, so that the engine can not adapt to the working state of reduced oil supply. There is nothing wrong with your car, but the idle speed is too low. It can be solved by slightly increasing the idle speed. Consult your manual and you will find the idle speed regulating valve.