Rich = COUNTER clockwise (left)
Lean= Clockwise
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This is for the High Speed (HS) needle!
The Low Speed (LS) screw can go either way depending on if it is an air bleed or not (not sure about the OS; can anyone else help him out?)
Try the following link for EXCELLENT advise on tuning a 2 stroke engine (lotsa other goodies on this site, too):
www.jettengineering.com
--look under "Tech Specs & Instructions"