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that's the basic idea. the exhaust is prevented from flowing backwards towards the airbox by that valve I mentioned inside the head. It's a reed valve type setup that only allows flow in one direction.
so, the fresh air is pulled by venturi action (I'm guessing) through the Kleen air switch when the vacuum operated switch allows it, during off throttle applications.
as far as the jets, the values/sizes are stamped on the brass bodies of the main and pilot jets. The needles have grooves for clips that determine needle height. you would need to read the numbers off the jets and see what position the clips are on the needles.
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