I am a newb to brushed motors... I'm much more familiar with brushless. Anyways, a while ago I bought a couple of buggies on craigslist both with fast brushed racing motors. The problem is, one of the motors is crazy fast rpm but it slows down extremely quickly when I let off the throttle, while the other buggy continues to roll. What does this really mean? I put triflo lubricant on both of the ends of the can (both bearings) and that helped some but not a lot, even with the motor out of the buggy the motor revs up then quickly comes to a stop. Any advice would be greatly appreciated! Thanks.