Champion spark plugs are just fine, but "needing a hotter plug for today's gas" is pure unsubstantiated male bovine excrement.
The actual truth is that "back in the day", tractors WORKED for a living, long hot days of "pulling their guts out", which limited how "hot" of a sparkplug you could use without causing "detonation", and blowing a hole in a piston.
With few exceptions, there's very few old tractors today that experience that sort of "balls to the wall" work for 8 or 12 hour days, which explains why sparkplugs that worked perfectly well in working tractors foul in lightly used tractors that put around or "parade queens".
(Please don't shoot the messenger for telling it like it was/is!)
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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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