Magneto damage

[Heapmann]

Picked up a used Manco 6150 Helix kart, GY6 150cc. The previous owner ran 2 screws into the cooling fan right into the magneto. Replaced it, got the kart running but I don't think the electric choke is working. Wondering if when the magneto got hit with the screws would anything have happened to the resistor for the electric choke. I read somewhere the resistor limits voltage to the choke in the event of a voltage surge. Don't want to buy a choke assembly without knowing if the resistor is good.

Thanks in advance