FWIW ill share a little today . Ok so Ive been really happy with my castle SCT system (other then the crappy switch) Im getting about 20 minutes of run time with a 5200mah 2s zippy lipo and I run it HARD . Its geared 16/62 (thats the stock spur size I think) . I don't usually have any problems with heat until last night . I was running around the park behind my house and it started acting weird and wouldnt go forward sometimes. Right away I thought it was the switch acting up again but upon further inspection I realized the fan I mounted on the ESC wasnt running and the ESC was pretty hot so I belive it was thermaling. I took the fan off and found a tiny little pebble caught in the fan .I cleaned it out re installed it and took it for a spin and all was well again. I guess what im trying to say is the SCT kit works really well but its crucial that the fan is mounted on the ESC and functioning properly . Rick

BTW this truck hauls butt it wont wheelie unless im on the gas and go over a bump but its wayy faster then I can drive it !!