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I have an older P2k BL2 that is giving halting, slow/pulsing response, especially compared to an identical sister model.  It also has a loud pulsing/binding noise when in motion. I have checked everything I can think of......axle gears ok, commutator & brushes are ok, gears in good order and clean and lubed just right, shafts ok., worm gears ok. Wheels at the right gauge and clean, wheel bushings are free wheeling. Decoder reset to defaults. All I can think of is that the motor is flawed.  On a bench test it seems to run ok, but there is play in the motor shaft...I can move it back and forth about a sixteenth of an inch or so. I think this may be normal, though.  I can't see anything that  would lead me to want to replace the motor.  Although I have a couple on hand and am tempted to give a new motor a try. Are motor problems so suble that they can't be detected with the naked eye so to speak?
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