Welp, I pulled the carb needle shims, thinking I had fixed the idle issues that had been plaguing me.
I guess I should have not been surprised it idled like crap and had to have the throttle tickled to stay running until I turned the idle knob in big time.
After much head scratching and thinking, I came to the conclusion that the slow jets must be the issue - the bike has plenty mid range and up top when it is running almost exclusively on the main jets, but idles for crap, takes forever to warm up, and tends to stall when the clutch is let out. Rather than drop $22 + $13 in shipping
for a set of new #35 slow jets (the press in jets are a real PITA to find), I opted to order up a $13 pin vise and drill bit set. A #80 drill bit is 0.3429 mm, which is pretty darn close to the 0.35 mm hole diameter of a #35 Keihin slow jet.
I carefully started to "drill" through the slow jet, and was surprised to dislodge crusty crap. It appears all the slow jets were reduced to almost half their diameter by crap. I had soaked these jets in old school carb cleaner, and then in the Pine Sol dip of doom, cleaned them out with copper wire, and there was still crap hanging on in them. Gah!