The blue in the exhaust is from burning oil. While a properly set carburetor will help keep the plugs from sooting up, the only permanent solution is to find/correct the cause of the oil burning.
Depending on how badly the engine is burning oil Champion D21 or D23 plugs (or another other mfr’s heat range equivalent…) may be hot enough to keep them from fouling.
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Incidentally you can do a quick “field rebuild” on the carburetor without taking it off the engine. Simply disconnect the air cleaner hose and choke rod, then remove the 4 screws holding the throttle body to the bowl assembly and drop the bowl.
Frequently it’s only the bowl that accumulates junk/needs cleaning. Unless the throttle body is plugged up really bad it can be cleaned simply by taking out the idle mixture screw and blowing the passage out with compressed air.
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Today's Featured Article - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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