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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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