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 - Case Farm Equipment - by Jeremy Sweeten. My name is Jeremy Sweeten and I am currently a junior at Purdue University. I am takin a dual major in Agriculture Systems Management and Agronomy. I am from North Central Indiana, Miami County to be exact. My dad teaches for Marion Community School Systems an outdoor lab called Asherwood. We live there to manage the place. They just happen to have a Case 311 with a Triple Range transmission. I grew up mowing, pushing snow, and hauling maple sap with it. In 1986 my parents bought an old,
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