Disassemble carburetor and install oil leakage.

Did you take them all? If yes, check whether there is any incompatibility. 1. Float should be flexible and cannot get stuck. 2. Check the oil needle (triangular needle). 3. Whether the throttle valve is installed backwards (the limit pin) with the inclined surface facing the air cleaner, turn the throttle valve to observe whether it is flexible and can be opened and closed. 4. Check the drain screw at the lower part of the carburetor and loosen it to see if there is gasoline flowing out. If there is-check other places, if there is no folding, it is a floating problem. Look at this.