I have CR29s on my 1980 CB750F DOHC.
I do not use the choke to start the bike. It runs super rich on idle. Fouling plugs if I get stuck in bad traffic. I have a couple sets of pilot jets to try out but haven't had the time. It's great on the freeway.
Try a 100 or 110 main jet. Wont help the...
Looks like you can still get them off of ebay. Not cheap though. Shouldn't have to do any engine readjustments. Maybe not carbs but you'll just have to see what happens after you install the can. If possible add an air/fuel sensor to the pipe if you really want to know what's going on. Easy to...
Check the brushes on the stator. I had a similar problem and once I looked I could see one of them had broke in half and the other was worn down. It's a $10 fix.