I had a few minutes tonight and put the cylinder at tdc (I think), and put air pressure on it (can I apply too much pressure?) and held the crank. I can feel air coming out of the valve cover breather above the cylinder, and I can hear the air at the exhaust tips, but not feel air. Nothing at the carb.

I may try it again to verify I had it at tdc.
Air at breather= rings? Air at exhaust = Burt valve?

The plugs in the engine a pretty new, less than 50 miles, and it really looks like that # 8 plug is new, maybe there is no spark in that cylinder? I'll have to check the wires for spark.

I will double check my findings, maybe after putting it back together and running it for a while.