They look good to me, especially for not getting worked hard. Some of the soot could be oil. The insulator is perfect!
Set the carb to what runs best.
Not having an accelerator pump, it will have to be slightly rich to not stumble. Nature of the design.
Most updrafts, the idle mix screw adjusts air bleed, not fuel, so turning the idle screw in richens the mix, out leans it. But that adjustment will have very little effect on the overall mixture.
If it were mine, I would be very happy with the plug reading!
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Today's Featured Article - Reflections of the Fifties - by "Country" Elliott. I remember rowing up in the 1950�s in a small, rural town in northwestern New Jersey. The closest town to ours was only 3 miles away, and there were seven dairy farms in the areas of these two country towns. We had 5 acres, and because my Dad was a salesman and not a dairy farmer, he let the Bockovens, who owned the Willow Tree Dairy farm most of our land.
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