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What do you use your 560 for? If you are doing only idling and light work you might get by with the D23 plugs, but…you would be only masking the reason the plugs are fouling out. Does your engine use oil, if so how much? If it uses too much oil, even the hottest plugs will not help much if any. Running an ethanol blended fuel may help it run cleaner, but again, won’t help a lot. Downside to switching to ethanol is that it has a tendency to loosen up crud in the fuel tank and lines which can plug filters etc. but once the crud is gone, the problems are too. If it doesn’t use oil, then they may be fouling because of too much fuel (or not enough air) getting into the cylinder. Check intake to make sure that it doesn’t have a restriction in it, or the carburetor may need work or float level adjustments. Good spark is important also, should have a bright blue spark that will jump ½ inch gap.
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