[micromatch]

im not very knowlegeable so bare with me but the same thing would happen with me when i got my 2 3.8 with a pink endbell and it seems to be that the 3.8 i got was a kinna big motor like a zipzap motor size or bensu clone so sumtimes the pinion gear meshes very very very tight so what i did is got a match and wedged it beetween the motor and the part of the chassis on the opposite side of the lil plastic tab that holds the body and the heat sink on and it worked perfect but if it doesnt work srry