Yes, there is an idle mixture adjustment screw on both of your carbs. The problem is that they are sealed at the factory with a hollow brass cap. If your carb is out of adjustment, I suspect they have already been removed.
There is a procedure to remove these caps. There is a tiny hole in the end of the cap that seals the idle mixture screws on each carb. The procedure to remove the caps is to carefully drill a slightly larger hole, being careful not to damage the idle adjustment screw behind the cap. Insert a sheet metal screw in the hole and pull to remove the cap. This can be done easily without removing the seat or side covers IF you have real good eyes and a steady hand. To adjust the mixture you will need a long (6 to 8 inch) screw driver with a fine slotted tip that has been ground to about 3/16" wide. Usually the screws are set to about 2 1/2 turns out in the front and about 2 turns out in back. To know where they are you have to turn the adjustment screw in till it stops. Use very light finger pressure since if you turn them in hard you can damage the needle tip or seat. Then turn them back out to the suggested number of turns.
I wouldn't want to steer you to a different forum but, there is a technical forum that covers this subject well.
http://www.intruderalert.com/cafe/index.cfm
There is a search feature there and you can find lots of info.
It sounds as though you may need to synch your carbs and there is discussion about that also.
Hope all this helps. I know how frustrating this can be.
Keep your shiny side up!!!
Gtruder
