I saw the same thing on my motor Richard. I sent George from 4 max a picture asking about this to which he replied 'that is how it should be'. Needless to say the motor stopped working a few minutes into the first flight, I contacted George again about this and he claimed I must have had a hard landing and damaged the windings. That of course was not the case because as I said it was its first flight... Having said that I do know many people like those above who have had good results from purple power motors!