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 - Converting from 6 Volt to 12 Volt - by Chris Pratt. It's a common problem for old machines especially when the weather starts to dip below 40 and the tractor isn't fired up as often. You are probably used to the 12 volt Diehard, charged with 200 amp alternator of your 3/4 ton that always is ready and always starts. It's this type of experience that brings about the many queries we get for 12-volt conversion kits. Since only a few kits are available (we sell kits for the
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