In this new post I will try to illustrate the difference between a working and a burnt Motorcycle denso radiator fan used by Kawasaki, Yamaha and some other bike manufacturers.
Below is an example of a burnt fin on the Rotor (Notice the black oxidized area around the shaft)
This however is an example of a good working Rotor (Notice the area around the shaft which is clean of any oxidization) and also the magnet which is still in good clean condition.