Clockwise is lean, CCW is rich. Start by gently seating the main jet full CW, (don't force it!) and back off 2-3 turns. Take a test drive. If it's short on power, go richer about 1/4 turn at a time until you get the best performance under full throttle load like up a long hill. If it stumbles and smokes black, lean it out 1/4 turn at a time. Once you've found the sweet spot, don't mess with it- - - -tighten the gland nut snug to keep the adjustment from changing and forget that it's adjustable.
If you make a major change in altitude, like from sea level to Denver CO, etc., the higher altitude needs a leaner mixture. If you're adjusted for high altitude, richen it up a little as you go downhill several hundred feet or more.
Jerry
