Well, it wasn't the choke either. I've taken each replaceable part from the 220 carb and exchanged them with my 200 carb. Nothing seems to help. I guess my carb is just toast. Must be something worn, beat, or warped that I can't see. I think I'm going to see if I can locate a new or used one.
Yes, I've gots some RZ's - a RZ350 and RZ500. Ride 'em all the time. Got 2 more RZ350's waiting to be finished. No museum restoration, just getting them roadworthy. And I've still got several RD's as well, but none of them run. They are all waiting for attention. If you haven't noticed - I'm a sucker for 2 strokes. :)