Guys....machine wind stockers tend to have a dud or two here and there...if you got one its bad luck thats all....I have my share of the experience too with Tamiya super stock motor. Fried one the 3rd run. Well done too. I would go for another one 'cos the performance is good. At one time...Yokomo super stock motor armature tend to fry too. Dunno 'bout now...haven't try one yet.
Bryan