Yeah ben due 2 that reason I have had 2 go back 2 brushed in d 2wd, so if anyones got old motors or brushes goin VERY cheep(free) , still I enjoy tinkerin with the motors n watchin simon skimmin them, very therapeutic n stuff, but it wont stop me KICKIN ARSE!!!! Just slow me down a bit on very steep ski slope style hills.........