OS 91 mixture
Say Hawk,
Just for you, I checked two of my 91's and with the barrel just closed, one was at 2 full turns from bottoming out and the other was two plus maybe 1/8 th....
Safe to say that two turns out with the barrel just barely closed would be a safe bet...
I read the instructions and could not find where they gave a definite starting point for the OS 91 fan engine.
Rod