they are on the bottom back side of the carbs, recessed. they are flathead screws and very small. be careful though, you can get your bike way out of tune in a hurry.
before making any adjustments, be sure to turn each screw all the way in and count the number of rotations until they bottom out. write these numbers down so you can return the screws to their original positions if things get out of hand.
you only need to turn them 1/8 of a turn at a time to notice a difference.
Being Liberal is easy.......but being responsible takes thought.