The pilot screw (Air adjustment screw) is located at the frontmost part of the carb, you may need to either remove a little al-u-minnie-um cap or use a D-Tool if it is not slotted. Most of the newer bikes require the D-Tool.
Here is a picture, it is the top most one, notice the carbs are laying with the rearmost part down.
And I run 89 octane in mine, big bore though with 10.5:1 compression. It likes it just fine.
