If it starts surging you are in big trouble. Means the gas may be boiling in the carbs. With road temps at 118 to 120 not uncommon here in Sac, lane splitting is a must. But you can't always do it.
Had that happen to me on the Tipga pass, going into Yosemite. I pulled to the shoulder and putted up to the side of the road by the Ranger entrance. 2 mile line of cars paying to get into Yosemite.
Ranger stormed over said I could not cut in line. I agreed, and just pointed out that trying to clutch uphill on 6% grade doing stop and go with an air cooled bike was going to destroy it, and I would just wait until the motorhome I was behind got up here. I told him I had already paid, I was just re-entering after going to Lee Vining for a shower. (no showers at Toulmene Meadows, unless you wanna dip in the freezing cold Dana Fork)
After hearing that, he asked to see my tag and my 5 day pass for camping and said "Well, since you paid already, just go ahead and go in. Have a nice day."
That little bit of oil that leaks on the fin? When it gets too hot, that will start bubbling. You are close to overheating.