Here's some great info for a better understanding of Keihin CV carbs and their circuits.
Keihin (CV) Carburetor Info
http://www.duncanracing.com/techfaq/Tech_keihin-carburetion-jetting.phtml
Keihin (CV) Carburetor Info
http://www.duncanracing.com/techfaq/Tech_keihin-carburetion-jetting.phtml