I agree with 80 psi compression is low. Check your plug wires and also the condition of your distributor cap. Also check your points, they should not be burnt or corroded and set to the proper gap. Another thing that you could check is your valve to rocker arm clearances. They do wear and need to be adjusted over time and often overlooked. For what its worth, I had an M that I could not get to run right no matter what I did. It turned out to have a cracked head and a bad head gasket. After fixing it, it starts and runs perfect. M's where bad about developing cracked heads. Funny thing about mine was, very little water would disappear from cooling system. Non the less though, there would be a few drops of antifreeze in the bottom of oil pan. To check that on yours, just let the tractor sit for a few days and then loosen the oil drain plug just to the point that it will drip (don't take it out) and if antifreeze drips out you likely have a cracked head or bad head gasket. This creates compression problems, and moisture in the combustion chamber fouls the spark plugs.
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Today's Featured Article - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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