Keep in mind what wiredgeorge says. He knows his carbs. You might want to research through the database to compare the differences between aftermarket jets vs. Mikunis.
If I am not mistaken, aftermarket jet sizes are a little smaller than O.E.M jets from Mikuni so you have to add 2.5 to the Mikuni size to match aftermarket.
Eg. An original 110 Mikuni would compare to a 112.5 aftermarket.
A good selection of main jets is pretty cheap to have on hand, and they are easy to change to play around with for fine tuning perfection.
Perhaps someone else could pipe in to confirm if my memory is correct on the OEM vs aftermarket sizing.
Cheers-Colin Firth
1977 KZ650 Custom. Brought back from the dead after 13 years of neglect. Totally rebuilt from frame up. Wiseco 700 kit. Ported, polished heads. Triple angle valve job. Properly re-jetted and rebuilt carbs, Filters, MAC Pipe, Barnett Clutch, Body mods, Bead blasted rims, 14 tooth sprocket front, Superbike Bars, Painted 2005 Chrysler Magnum Red with silver and gold stripes. Only 13,000 miles on bike. Runs and looks like new and does it ever jump off the line! Colin Firth-Ontario-Canada
-1977 Kz650 Custom bought new by brother. Now with 810 kit, GPz750 cams, intake valves, Mikuni 29 smoothbores, velocity stacks, Dyna Igntion, MAC pipe and other goodies.
-1982 Ferrari 308 GTSi Red/Tan
-Toyota FJ Cruiser - 6 speed tank
-2010 Mazda CX-7 Turbo (my bride's)
-1998 Jeep TJ Wrangler 4.0...
