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 - Gettin My Old Tractor Home - by Clayton Sweeney. My name is Clayton Sweeney. I am from Southern Maryland in a small town called Lothian. I am 20 and my father and I are the proud owner of a 1954 Allis Chalmers WD-45. When I was 18, I dated a girl in the next county over. Her family are tobacco farmers. It was a cold Thanksgiving evening, and we were going up to her Grandparents house. As we passed one of their barns, I noticed something orange in the corner of my eye in this old shed. It was pretty dark and I asked what it was
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