I think that is probably about right, I know I am fairly comfortable at 130-140*, I am betting I am right around 150* give or take a couple. In the past I have used the 10 second rule and that has worked for me.
Cheers,
Jim
lol well at least I'll feel comfortable buying used electronics from you. You could probably even gear your motor higher for more top speed if you wanted before temps started to be an issue