Fargo, listening to the video, I'm not heating an engine that idles well, or runs well.
Sounds like a bad exhaust leak (blown manifold gasket, cracked/burned out manifold), or an externally blown head gasket. Though an exhaust leak won't cause running problems, a head gasket will. Can you tell where the leak is? You should be able to feel the leak, or a shot of oil in the carb intake will give a smoke bomb effect.
There could be valve problems, out of adjustment, broken spring, bent pushrods, loose valve seat. A visual inspection and valve setting will be helpful, and a compression check/leak down test too.
A quick and easy test for valve/compression/general engine health is to remove and ground the coil wire, remove the air filter hose from the carb, hold your hand over the carb inlet, crank the engine through. You should get strong steady vacuum. No intermittent pulses, no back flow.
The only other thing I would check, side play in the distributor shaft. Any play will cause the points to not stay set. The points going out of set is often associated with changes in RPM.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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