Also, on this 15, a problem I have never had before, if I run it completely out of fuel, the carb heat soaks and vapor locks. If you guys don't know what that is, it's when the carb slide becomes so hot that the fuel vaporizes as soon as it touches it and you get a no start condition. My old Losi engines did this, but they had all aluminum carbs. Engine temp is 235-245, nothing else out of the ordinary...

I guess the same thing could happen if I shut it down then tried to start it after about 15 seconds.... I don't think running it out of fuel really is the cause. I just don't remember ever having the problem before, struggling to restart after a flame out for whatever reason.