So..... been riding the wheels off of this machine while all my others just sit. The other day i suddenly got a vibaration from the motor that happened only when there was no load (like on a down slope). I pulled the motor and went in. what I found was on the apposing end of the brushes a set of points that i can only guess is a shut down system. With it is a plate with three short bars connected with rubber bushings. The plate that holds them broke letting one of those short bars float (No damage inside that I can see and the motor was operable up to taking it out). I am going to need this plate. The bearings and brushes seem fine but should I replace them? Steve, from Wattsup told me to post this to see what forum members might say.