The motorcycle Tian Jian 125 valve speeds up. It is normal to start in the first gear and refuel in the second gear. After a short pause, it will feel normal (that is, it will not refuel). ...

This should not be a valve problem, but a carburetor problem. If it is the third car, this situation is relatively normal, and there is no need to adjust it deliberately. To solve this problem, we can check whether the mixture ratio of carburetor is too thin and whether the fuel needle of throttle valve is too low. If it is the third car, the fuel needle cannot be adjusted, mainly because of the design problem of carburetor, which sacrifices acceleration for environmental protection. If the mixing ratio is slightly thicker, you can try adding a thin pad under the oil needle to see if the situation has changed, or if there is a second car's main nozzle or other suitable main nozzle and main metering hole. If there is a suitable carburetor, you can also replace it to see if it can be solved. In addition, if this happens only when the car is cold, it will be fine if it is not hot.