On a new engine I turn the pump about 1/8 of a turn at a time, once I'm very close to the final setting I turn it 1mm at a time, and it is noticeable. My needle valve is usually at 1 turn, on the new engine I'm still breaking in is a little more than 1 and 1/4 turn. The pump on the CDI engines comes with a rich setting, get your engine at at least half power and go to idle, it should establish a steady idle without an increase or decrease in RPM, if it increases the regulator is lean and vice versa.

Good luck!