See pic...can you tell me when the brass floats on the left were switched to the plastic ones on the right? My KO and K1 have the brass. Not sure if it will help, but the brass one came from a set of carbs with #120 jets and the black came from a set with #105 jets. Can either float be run on either jet? And can I mix these brass and plastic floats on 1 set of 4 carbs or should I stick with one or the other? Why all the questions...I am thinking of putting an extra set of K1 carbs on my KO so I can adjust the fast idle on the fly. Plus, it will sure be easier to keep them in sync.