Years ago we found by adding some "104+ Octane Boost" bought at Wal-Mart helped prevent fouling of the spark plugs. We discovered this around 1990 with some other low compression air cooled engines. The sparkplugs didn't get plugged up with deposits they just got a black coating on them that would short them out by letting the electric spark flow thru the carbon film instead of jumping the gap to create the spark. Cleaning the plugs helped but we found the octane boost cured the problem. I add the octane boost to tractors that will sit for long periods of time without being run. Other than that I don't use it in the everyday tractors unless they need it.
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Today's Featured Article - Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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