125 what's the matter with the slow reply of the motorcycle?

When idling, the speed behind the fuel filling valve slowly recovers. Check whether the mixing ratio of the carburetor is wrong, whether the throttle pipe, throttle handle and carburetor throttle are stuck or stuck, carefully clean the carburetor, and check whether there is slight air leakage in the intake pipe, whether the valve clearance is too small or slightly closed, and whether the idle speed is too high. If it is a new car, this situation is nothing. Generally, with running-in, it will naturally improve, and it will return to normal before long.