My 56 Mercury with the 312, carb is an Autolite 4100. I have it all cleaned and rebuilt. Everything I see/read says to set the two adjustment screws 1 1/2-2 turns out as a good starting point. My question is which way do they commonly go from there? I realize every engine will be slightly different but I don't really notice a difference from 1 1/2 to 2 1/2 turns out. I have held at different RPM and adjusted, but still don't notice a difference. I have not had it out of the garage yet, I am guessing I may notice difference when the engine is under a load? Is this simply going to be a trial and error method?
Any tips/suggestions will be appreciated.