I sent my pregen carbs to Gordon and they came back looking like new, as previously reported by happy customers. I knew that my carbs had some small problems like backfiring occasionally when slowing down, and stumbling after a long downhill coast when I got back on the throttle, but overall I thought they were in pretty good shape.
Now it really is like a new motorcycle. It started and settled down to a 1,500 rpm idle much easier and sooner than I'm used to, and it no longer needs the needle shims I put in to get rid of the 60 mph steady throttle surging. Luckily I asked Gordon to leave them out. It pulls smoothly and steadily from idle to redline.
Thanks @
ducatiman!