Ken, those plugs are still available, althought the C86 seems a bit cold for a pony motor. If I remember correctly, we ran C87's in our R... and they were the same plugs that I ran in my 48 model A. Dad used to run C88's in the 46 A we had because it was harder on plugs. All of them will interchange, just different heat ranges. Everyone on here seems to favor Autolite plugs for the 2 cylinder tractors, but I have always used AC's and had great luck. I just bought a set of C86's and C87's a couple weeks ago at O'Reillys. Hope this helps!
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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