To test an electrical system it's handy to get a volt meter. It will not only tell you there is voltage there but the amount. Harbor Freight has a pretty good one they used to give away but is certainly cheap enough to buy at six bucks.
I wouldn't want to feel if the coil is creating a spark. The spark from an engine hurts as bad as touching household electricity.
From the second picture I would lean toward the coil wire as being the problem. The metal end of the wire is missing. If the wires are in that rough condition it would probably be a good idea to replace the spark plug wire set. They make a spark plug wire tester which sort of looks like a tire pressure gauge you just lay on the wire while someone cranks and it will light up when there is a spark. https://toolsquik.com/lisle-ls19380-spark-tester/
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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