Andy, hate to bring this example up, but I have a '40 H that ran like a top until last year, when it kept missing on a cylinder. Tried everything in electrical, tried adjusting the valves, just could not get it to run right.
Then followed some advice, and found that the intake valve guide was worn and leaking oil. Intake stroke sucked it in like a pump. Compression test wouldn't show any problem, 'cause it sealed on the upstroke just fine. Yet fouled the plug so fast you wouldn't believe it. I changed the head with another, and the problem vanished.
I HOPE it's something else, but when you check the valve train, see if any of the intake valves have any side to side play. They should be tight. If you find play, you need a valve guide job, or a new head.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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