I saved this from somewhere, but don't know who wrote it:
I have 30mm round slide Mikuni Vm's on my Rapide.("PIP", CRap/D
motor)
After some fiddling, they work a treat, set as follows;
Vm30ss As Supplied Now
Main Jet #220 Now #195
Pilot Jet #30 Now #35 (mixture screw 1+1/4 turn out.)
Needle Jet 159P-8 Same
J/Needle 6DP17 (centered) Same
Slide #2.5 Same
Air jet BS30/97 2.0 Same
(2) #002-351, Cable type starter system, conversion kits.
(2) K+N Air Filters
"PIP" is capable of idling cleanly and continuously at 400 rpm, if so
desired. (That just drives the Harley guys nuts)
Motor pulls cleanly from idle to 100+?
(Who believes our Smiths anyway!)
I think 32mm may be a little big for a stock Rapide. I think I'm
pushing it a little with 30's. Your pilot jetting seem very rich
to me. Are you finding if difficult to get your idle mixture lean
enough?
Sudco Mikuni has a very complete tuning manual available, well worth
the price.
http://www.sudco.com/mikuni.html#manual
It might have been on jtan. I also searched here and found Robert Watson's flatslide 34mm settings, but that's all after a superficial look. You may find more with a closer look.