Re: evinrude
The numbers on the carb knobs are just a reference point. The large knob is high speed, small knob idle. To adjust these knobs, loosen the center screw, and put the knobs on backwards. When you do this, you will see that each knob has a projection on the back side that will allow the knob to turn 180 degrees in ether direction. Adjust both knobs were the motor runs best. Now remove the knobs, and put them back on with the projection at 180 degrees from there brass stops. As I recall, this will put the number 3 at 12 oclock, and leave you with a liberal amount of turning for fine tuning.