Red: Carb Issues Cont.

After riding a few days ago, came down to find that Red would not hold idle.  Classic symptoms of an air leak.

Found that the stud bolt was just turning and not tightening.  Swapped it out for a regular bolt.  After that, held a very rough idle and needed a lot of throttle screw to keep it going. 

As a test swapped Ivy's Keihin (K1 EO5) with Red's (CS90C). 

Red idled ok but floats were stuck and gas came pouring out the overflow tube. 

Red filter very dirty.  Is it possible that having filled the tank to its highest level in awhile, it loosened a lot of rust and debris that found it's way into the carb and clogged the jets?