Unlocking the electronics of the Skyteam and Zhenhua 125cc is only done via this bluetooth box
To complete the unrestricting you can / must fit these parts:
3-Since the engine speed will not change (Reminder: the ECU in racing mode the power is higher but not the maximum speed), if you want to gain speed you will also have to change the transmission ratios via either the front gears and the rear : larger sprocket in front and / or smaller in the rear.
Is the Bluetooth module too complicated for you?
See this solution to remove the injection and switch to carburetor mode also available with a carburetor included in the kit
We also offer a 146cc bore up kit for Skyteam / Lifan / YX engines