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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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