I've heard a lot of people bashing the cms36 series motors. I personally run a 6900 on 3s in a 5lb rustler geared to 67mph so far and the motor barely gets warm on speed runs of course. Off road and tearin about on 2s geared low, it does heat up some, but the esc always heated up more than the motor for me. Highest I've gotten on the motor itself is 160s I believe, esc shot deep into the 200s a time or two, I've since added a fan and bec to help, now it stays really cool. But I dont know why people are so quick to pass off those motors as junk. Sure they run hotter than your average motor, but they can take it as well. Probably not the right place to argue this, but just wanted to tell my experience with a high kv motor from castle.