http://www.bluebassdesign.com/boonin/carb_faq/#is

Its all in that section. I don't have a diagram up on the location of the screws, and sorry for that, I jsut never got around to it.

This exploded diagram shows the screws locations, however:
http://www.bluebassdesign.com/boonin/carb_faq/images/22r_carburetor_diagram.jpg

Quote
To reset the idle mixture screw for a 22R:
ò 1982 - 2.5 turns from fully closed
ò 1983-88 - 4 turns from fully closed.