Farmall Super A running rough

Attached is a video of my Super A. It is not running quite right. Sounds like maybe a bad spark plug or bad plug wire? Can any one offer advice just by listening to the video? I cleaned the inside of distributor ( all contacts, points) did not check points gap. I checked and rechecked that I put plug wires back on in correct order. I took carb off and cleaned. It was full of sludge when I got it. Took gas tank off and cleaned. Took sediment bowl off and cleaned.

Tractor sounds like something is missing. Sounds like a pretty consistent pattern of miss. Speed it up, slownitndoen, sounds about the same just quicker or slower.

I just bought new plug wires. Have not put them on yet.

Any help is always appreciated!
 
Let me ask this simple question. Did you check you oil air breather unit. I have a John Deere here at my house and my dad was to check that and keep it clean (well) it started to miss fire and sounded like it might need a tune up. I took the oil bath off the air cleaner and check it and boy it was full of oil, water, and dirt. Dump it out clean it and put new oil in it Happy to say it runs great. This only a suggestion that you might want to check this unit.
 
Pull the spark plugs and lay them in order so you can compare them to the cycls where they came from. Noow do a compression check while they are out noting the reading with the plug where it came from. See what you find out. Compression check is the first thing always to check on a new to you engine before throwing parts at it
 
Listening to the video, doesn't sound like a single cylinder misfiring, almost like the governor surging.

I would go back and check the distributor shaft for side play, needs to be very little side to side movement or the points won't stay set. If it is good, check the point gap. Also check the centrifugal advance. It should turn a few degrees and spring back. Could be stuck or sluggish.

And check the air cleaner, especially the wire mesh inside the canister, often overlooked. Check for mouse nests, mud dobbers too.

Back to the surging, that is typically a mixture problem. Once the other things are checked, try playing with the idle mixture screw. Most of the old carbs worked backward, turning the screw in richens the mix, backing it out leans it. If it changes nothing, there is a problem in the idle circuit.
 
I watched a video, I need a compression tester. Test it wet and dry. My question is if the tester will fit. I know when I changed the plugs I had to buy a thin walled socket as my normal sockets would not fit in the plug well on 2 and 4.
 
I will check the breather. I also want to drain oil, new filter and and new oil. Probably should do new hydro oil as well. Maybe even radiator drain. I do see the overflow tube near the radiators neck is not connected. Hopefully I can soldier this. My Allis Chalmers had a broken tube and I ended up having to buy a new radiator for about $250 after I broke it even more tryin to fix it!😠 There is no coolant temp gauge on this tractor. read that some had some did not. Same for some having hood louvers some not. I'm assuming the oil fill is the pipe on top of the valve cover?
 
OK, I think I found the problem. Or I found a new problem. I took the air filter off, it was full of oil
and gunk. Got that cleaned up. Took the carb off and got that cleaned up but I should go get a rebuild
kit. I took off the cast iron exhaust. I took of the valve cover. Once in looking at the valves, I
noticed the push rod closest to the gas tank (#4) was not connecting with the rocker arm. I loosened the
nut and the screw, and got the push rod under the rocker arm. I then noticed what probably caused this
issue. The opposite side of that rocker arm is a spring. This spring will not move. I can push all of
the other springs down. This one will not budge. I hit with a hammer and it did move but then I thought
I better not do that. (might be easier to pull out than push in). I sprayed PB Blaster to the stuck
valve. Letting it sit over night. The million dollar question is: How to I get a stuck valve unstuck? I
know I will need to buy a gasket kit when I go to put everything back together (valve cover gasket, carb
gasket, exhaust gaskets). Hopefully I do not need to take the head off. I have never gone that deep into
an engine. I am a little afraid.
 

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I also noticed the front three and the back three rocker arms have a string tied around them. The middle two do not have a string. Hopefully you can see the string in the overhead view.
 

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