i got two old eletric monster trucks{Monster Beetle and BlackFoot Tamiya's}.i also have a duratraxx Maxium ST Pro.i've torn up the plastc spur gear and a metal spur gear{shattered half of the 48 teeth off it}.i'm surprised i haven't broken the pull-start,i've had problems with starting it when i first got it, running the pink nitro fuel.now,since i stepped up to 20% it starts up it 3 pulls.