Checked for leaks in the carb boots. Idled solid @ 1100 except for #4 where it went up (maybe) 50rpm for a little bit. I'm assuming the boots are ok from these results.
No, that is an indication of an intake leak. If this condition was present during carb sync, then the carb sync is wrong, too.
Unsuccessfully tried to adjust the choke knob so that it wouldn't fall down (right now it either sticks open or closed but will rest nowhere in between).
The base of the choke knob at the mount is a friction adjust. They can wear out and no longer pinch the shaft with adequate friction for positioning at any setting.
One irritant is that I am beginning to think there is a fuel line issue as when the bike is idle @ 1100 if I crank the throttle (instead of very slowly turning it) the bike will fall off and stall if I hold it. If I let go quick enough the bike won't stall. It's not a total problem but might as well try to fix it.
The slides are mechanically linked to the throttle. At idle, there is high vacuum to draw fuel through the fuel jets. Snapping open the throttle causes a sudden loss off vacuum, and resultant loss of fuel being drawn through the jets. The accelerator pump should provide fuel specifically for this event, so the engine will pick up smoothly. When the air velocity increases through the carbs, the venturi effect restores carb vacuum pulling on the fuel jets again.
Your symptoms indicate a fault in the accelerator pump feature.
Cheers,
