Check that the pushrods are in place in both rocker arms on the non-firing cylinder head.
Typically, a valve is open at hot shutdown, sticks, and then the pushrod either bends or simply falls out of place at startup.
If a vertical shaft engine pushrod may be laying there intact, pushrods in horizontal shaft engines are more prone to getting mangled when they fall down.
In my experience, running a good syn oil like Mobil 1 makes valves sticking much more unlikely.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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