Chances are you are having starting issue with your scoot! This is a direct replacement starter solenoid for your scooter. This will work with all qmb139 engines. How do you know your scooter even has a qmb139 engine? Most chinese 49cc /50cc scooters have this engine. To be sure you can walk out to your scooter and put it on its center stand. Just in front of the center stands pivot bolt is a series of numbers stamped on to the engine, you will be looking for "qmb139" mixed into the number. If you see these digits, this is your engine. Some of the symptoms of a bad starter solenoid on a chinese scooter is: battery is completely charge and your are only getting a click when the start button is pressed. Be sure one of your brake levers are pulled before you press the start button.
This spark plug will also fit:
Chinese scooters from 49cc-150cc.
Genuine Buddy 125cc-150cc
Kymco People 125cc-150cc