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Excessive brush wear is caused by;
overload
high temps
contamination
wrong type of brush
silicone fumes (believe it or not, silicone apparently causes accelerated wear)
and spring pressure
Most likely for airsoft motors is spring pressure and bad comms. If you take it to someone who knows what they're doing, they should be able to fix all that.
Although it COULD be the brushes aren't meant to handle the current you're putting through them, but if there's clouds of graphite coming off when you run the motor, then I'd say it's springs or comm.
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