Kneel to ask which expert to teach, 125 tricycle, the throttle rises automatically after the fire.

Check whether the mixing ratio of the carburetor is correct, whether there is slight air leakage after installation of the carburetor (unlikely), whether the air door is used correctly, whether the idle speed is set too high, whether the throttle handle and throttle line are installed correctly, whether the throttle is centered, and whether the oil needle is installed. Most of these situations are related to improper installation of throttle pipe or throttle.