I would start by checking the out flow of the pump. Into a can or a clear line on the pump. Watch it while running. Those vacuum pumps tend to fail after a few years. Lets air into the system.
Check the valve settings cold page 2-1.
This is the hard one. Rotate the engine until the valve is off the seat.See if the seat shows any signs of being loose.
Check the intake manifold for leaks. This was a known problem on some units. Not sealed properly at the factory. Some units took years to show up.
What brand of spark plugs.
I will check my notes. For any odd problems I ran into over the years.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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