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lonex brushes are known to be soft, though all the brushes on my motors have been holding up after a season and a half, so I'm not sure what exactly is going on. in your case, something else could be happening, they wear out fast, but not as fast as a few hundred shots. It's not uncommon to see sparks from the brushes of any motor, but something is definitely sounding off with your situation.
As for the rof drop, it could be that it needs a cleaning where the brushes make contact.
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I futz with V2s, V3s and V6s. I could be wrong... but probably, most likely not, as far as I know.
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