I glanced over the spit and sputter thread, and while I don't think the wires were necessarily the problem, I have seen the graphite core wires cause problems on tractors with points and I always use either the stranded wire core or spiral core wires.
I think the problem is that it seems to be nearly impossible to find decent quality graphite core replacement wires rather than being a problem with the concept of a graphite core. Sometimes too there are other weak areas that the graphite wires exacerbate due to their higher internal resistance. Graphite core wires run 8- 10 thousands ohms resistance vs. practically zero for wire core. That resistance is going to encourage leakage elsewhere while it's building up to fire the spark gap. Throw in a weak distributor cap or some dampness for instance and your voltage may find an easier path to ground than where you wanted it.
My most recent experience with those wires was automotive rather than tractor. A couple years ago I bought a C30 Chevy with a TBI 454. I drove it home but it didn't run right. Mostly in good shape, some unknown re-man motor under the hood. The PO had, in the previous couple of months, put on a brand new set of parts store wires, graphite core. In my shop I dug out a used grubby set of MSD spiral core wires that I last used 10+ years ago on the dirt car. That 454 dramatically smoothed out with just a change of wires.
Again, quality of the wire, not necessarily the concept of graphite core. As others have mentioned, the O.E.'s churned out millions of new cars last century with graphite core wires. Of course they were gone when each cylinder got it's own coil. Interestingly, the factory type wires for my 99 suburban are spiral core rather than graphite. Perhaps even the O.E.'s were phasing out the use of graphite wires at some point.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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