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If it melts the solder holding the wires to your brush hoods, it's too hot.
Heat is caused by resistance in an electrical system, and a motor is basically just a great big resistor. The brush hoods are big resistors, the brushes are resistors, the armature is nothing more than a really long strand of wire. The commutator gets so damn hot you can't use anything less than silver solder. And the more current going through it, the more it'll heat up.
The motor in my 249 is a ferrous magnet eagle force, it's two major advantages are being energy efficient, and low in heat (because it requires less current to run), and I run that bitch so hot my hand starts sweating through my glove on the grip.
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