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Adam, I have had that problem with the newer Atlas B23-7 and SD60. I traced the problem to a painted stripe on the motor. I cleaned it off and the units run pretty good now. I wonder what the painted stripe was for since it was put on pretty thick. One thing for sure, they will run better after they have broken in and also they will run better if you "warm" them up first by running them around the track at a high throttle setting.
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