1972 Scout 2 out of wack

That's the symptom I've had and witnessed exactly. Limp at first cold start. You could hear it crank faster as the weak cylinder came up under compression that was not there...

After I worked new fuel in to it and a few starts with carb cleaner in the throat it has been fine since.
 
Ok, sweet...you got it running again! Now help us understand the rest of what's going on.
Robert and some of the oregon fellas have experience with sticky valves. In a nutshell, fuel varnish "glues" the valve stem inside the valve guide. Not even the valve spring can return it to the closed position. But like rk says, it tends to get better with heat. The carb cleaner trick is good and with a long drive and fresh fuel should clear that up. No experience w/mystery oil personally.
But you are also mentioning a stumble or bog off idle or at low rpms. Is this a new problem? Have you looked at the accelerator pump? Should squirt a nice stream down the barrels when you rock the throttle.
Other than that, it looks like your carb May need some love. Any chance you could borrow another one to try?
Let us know what you find.
 
By the way I just went through another round of this with my Scout about 1 month ago... Started fine after a long spell of inactivity. Took it for a long freeway drive. Had lots of old fuel. Stopped at a buddy's house for a long evening and bbq. Went out and it would barely start. Had the bad limp upon cranking, like maybe 2 cylinders had compression. Had to run for about 2-3 minutes before magically smoothing out... The next morning the same thing... Smoothed out after about 2 mins. The following weekend I filled the carb bowl through the bowl vent and shot a bit down the carb. Started better. Filled the other tank with new gas and topped the other one off. Drove the snot out of it. Been ok since..
 
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