I Stalled in traffic today ,At a stop light. Twice idling at about 1200-1300 it just stalled .Moved up idle to 1400-1500 and it did not happen again ;What could have caused it . Any ideas?

how warm was the bike. mine will stall if its not at 145 or higher at least if i dont pull the choke.

Tookit out today no problems ;when it stallrd it was at running temp. after about 13 miles..Adjusted the clutch lever for min. travel and that slight judder stopped. I guess i have to get used to it.Still loking for gap tool that will measure .055in or 1.40 mm to see f i need to throw out those plugs. Temp has gone up to 183 at its' highest reading. Mileage went back up to 27 mpg. So far I've gotten 36; 32; 28; 23; and today 27 mpg. is it my style of riding or is mY PC III fluctuating.???