Dang, day late. If anyone knows of another one please pm me. I just bought another roadie with a 40mm mikuni, but bike sat for three or more years. Tank had about a half coffee can of rust in it, and carb is equally bad. I took it apart and cleaned it, but still coughing bad, and backfiring when idling. I am not a carburetor guy. Would just like to buy one and put it on.
Run some Seafoam in your fuel(about half a can to a full tank) if your not already. Run it hard in second, third, and fourth(high RPM
's)to get the treated fuel to as many places as possible. The Seafoam will do wonders for crud clogging passage ways etc.
If it works for you great. After this, put a couple ounces in your tank when filling it every other time or so.
I trust you changed out the fuel filter by the fuel pump(if it still has one) as well?