NEEDLE SETTINGS: These are pre-set from the factory and require little or no adjustment
(BS)
High Speed - 3 turns out from fully closed
Throttle Stop Screw - 1/2 turn out from fully closed
Mixture Control Valve (low speed) - Flush with indentation on screw head pointing at 2:00
http://manuals.hobbico.com/osm/21vzb-vspec-manual.pdf