when you look at the needle you can do one of two things...lean it out or make it richer, so to lean it out, move the c-clip 1 slot up, to make it richer, move the c-clip down 1 slot down...if you happen to have it in the leanest slot and its still running rich, jet down 1 size and return the c-clip to the stock position, same scenario for being in the richest slot, jet up and stock position for needle.
this is how I break it down so it makes sense to me..