NAPA was closed so I borrowed a neighbor's 11/16 (0.02 in. less than 18mm) tap and ran it through. Compression meter fitting now bottoms out as does spark plug. #1 compression now 150 psi, same as the rest so this is not a valve/ring problem. Tractor smoked a good 20 minutes after cranking while all the crude accumulated in #1 cyl burnt up.
Cranked it again last night (in the dark) and could see some sparks jumping around #1 plug wire (arcing to neg pole of coil where it was touching) and at #2 plug. When I shut it off I was still seeing light between #2 plug and wire cap and I think I heard crackling (faint). I'll have to replace some wires later this week. I also think insulation on the pos/neg terminals of the coil would be in order. Still, tractor sounds much better.
In summary, the problem was in the ignition system (loose electronic ignition pick up, and SPlug wiring) and a cross threaded spark plug preventing it from seating. Cross threading might have happened during the trouble shooting. I'm going to be looking for better wiring. The little brass crimp on fittings at the distrib end of the plug wires are really cheap. Any one know where to get some good heavy duty SPlug wires?
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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