I am having some trouble with my 1951 John Deere B. It is not running smooth, and the cylinder firing seems to be erratic. It seems to run rough at either low throttle or full throttle. It also seems to be running pretty rich, as it will start to blow black smoke when it is running rough. Here is what I have done so far:
Pulled carb out and cleaned the passages. I removed the drill plugs, and used some stainless steel wire and brake clean to clear the passages. I have not drilled them out yet as I cannot find the correct size bits in the right length locally.
Confirmed I am getting a good fuel supply to the bowl. I also checked to make sure the float was adjusted properly, which it does appear to be.
Pulled oil cup off air cleaner and it was caked with some nasty yellow oil. I removed all of that gunk. I thought maybe there was an air supply issue, since it was running rich, but it did not seem to make a difference.
Compression tested both cylinders. LH side is 98 PSI, RH side is 96 PSI.
New spark plugs.
So far I have not gained any ground. My next thought is to look into timing, maybe it is not set correctly? Does anyone have any other thoughts? I attached a video of it running to try and help. I really appreciate any feedback.