pit bike wireing extra wire?

The King

New member
i have a 4 stroke 125cc pit bike no idea what engine make looks like a
lifan engine. but i recently put a new stator plate on and wired it up it sparks fine but there is a extra wire that has some sort of sensor/plug on it that plugs onto the engine just above the sprocket but the other end i haven't connected to anything does anyone know what this is for?
 
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