From all that I have read about jetting The A/F screw is used to adjust 0-25% throttle, the clip on the needle adjusts 25-75% and the main jet adjusts 75-100%.
This thread from highlifter might help also.
http://www.highlifter.com/forum/Basic_CV_C..._1872049/tm.htm
This thread from highlifter might help also.
http://www.highlifter.com/forum/Basic_CV_C..._1872049/tm.htm