George, you probably didn't do the motor any favors by regularly starting it up and running it for a few minutes. If it doesn't get hot enough to vaporize the water inside, condensation will just build up from blow-by gases.
It sounds like there's rust on the valve stem. You can remove the manifold and shoot some oil directly on the valve stem.
One trick to free a stuck valve is to get the problem cylinder on its compression stroke, then stuff rope into the spark plug hole. Rocking the crankshaft will cause the piston to bump up the stuck valve.
I used to add Marvel Mystery Oil to my gasoline to prevent valves from sticking, but I quit because I suspected it was causing rubber fuel lines to rot out prematurely.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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