The carb instructions are with the engine instructions. You can download them here:

http://www.osengines.com/manuals/160fx-ring-manual.pdf

As far as the "correct" setting is concerned, it depends upon fuel and propeller. You set the idle mixture where you get a good idle and acceleration. We don't have any "number of turns" to give you. Usually, though, it's not far from the factory setting.