My stock motor in my HPI Racing Sprint 2 Sport Drift Rtr is dying I think I'm not sure but it takes a few seconds for it to start going forward even when I'm giving it full throttle but it works perfectly going in reverse I think its the commutator but that's not replaceable I would have to buy a new motor I need some feed back I'll buy a new motor if I have to I just want to know if I'm for sure going to have to or not