Did you see any reason for the ex valve to loosen?
If the jamb nut was left loose, that is an obvious and correctable reason. But if the adjustment was still where it was set, and there was a major change in the lash setting, the change had to come from somewhere.
A bent pushrod is easy to determine, just spin it and watch for wobble.
Also check for a broken valve spring, or a sticking valve.
Another cause though can be a valve seat loose and falling out, holding the valve down. Sometimes they will go back in place temporarily then come out again.
Doing a compression test will show some loss if the seat is loose, total loss if it comes out.
As Janicholson said, check the distributor bushing, point condition and gap. Check for spark quality at the plugs.
There is a drain plug in the bottom of the carb. With the engine off, fuel valve open, pull the plug and catch the gas in a clean glass. The flow should be a solid stream, slow to a trickle as the bowl empties down, but continue to flow as a trickle, not stop or slow to a drip. Look at what was caught, check for water or trash. If contaminated, the tank may need to be cleaned, whatever was in the glass will also be in the carb.
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Today's Featured Article - Women and Tractors, A Woman's Touch - by Teri Burkholder. I thought I would give you a little background on how I got myself hooked on tractors and their restoration. My family is a very "crafty" bunch of people. By crafty I mean good with crafts!! My Dad is a retired industrial engineer from Bucyrus Erie which made big shovels for excavating and he is also a wonderful wood worker. My mom and my "guardian angel" has had her own ceramic shop for 30 years and is an excellent painter. With these skills always active in our house it was hard not t
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