Trying to get this straight in my head. On the CB350 carbs we have a screw sometimes called a mixture screw, sometimes called a pilot screw. Fuel is drawn in through the pilot jet, air is drawn in through the slow air jet, and the two are mixed BEFORE ever encountering the screw. This mixture flows past the transition ports to the mixture screw and on to the idle port. The screw itself only regulates the mix going to the idle port, not the transition ports. Anyway, since the screw in question regulates this MIX of air and fuel, it seems to me that it is not a mixture screw at all, but really just a pilot screw, and would only regulate idle SPEED at fully closed throttle. I mean how could it really adjust mixture if it's changing the amount of air and fuel at the same rate. Seems that only by changing the pilot jet could you actually change the mixture ratio. Not like on some carbs that have an actual air screw or an actual fuel screw. Any thoughts on this?