After sitting overnight I drained the carbs and removed the drain screw to shoot carb cleaner up into the float bowl. I did both sides.
I removed the air cleaner elements, they looked dirty so I cleaned the foam and put them to the side to dry.
I pulled the plugs, which had no more than 3000 miles on them, for inspection and noticed they were carbon coated, not enough to be a primary culprit but enough that I cleaned them all up.
based on the plug condition and for fun I checked the F/A screws and found them out about 6 turns, I reset them to 3 turns out from full in.
I started the bike up with the choke open enough to hold a 2000 rpm idle, it sounded good and strong. I sprayed some carb cleaner into the air box a few times letting the idle ramp up 500 rpm, letting the bike run a bit and them hitting it again. I did this about 8 times with just a short burst of cleaner each time.
The bike ran for about 5 minuets and then started to die, it ran long enough for the temp gauge to get just past the second hash mark into the normal range.
I broke for a quick dinner.
I returned and started the bike right up, it took a little choke to keep it going and it sounded like one of the cylinders was not firing. A little throttle got things right with that.
After about 3 minutes it started to die again. I used the throttle to rev up to 2500 - 3000 rpm. and the bike ran fine, as long as I held it over 2500 rpm. I ran it until the cooling fan came on and then let off the throttle and it revved down normally and as it fell below 2000 rpm it died.
Should I keep cleaning as I did or is this a definite problem that requires a carb pull and rebuild?