What the others said is right on. One more point is that running on like that is telling you something that you should be paying attention to and that is you are running at, or darned close to detonation levels due to compression ratio and fuel quality. If it diesels or runs on only after a hard load and coolant is hot then you could be OK but should be listening very carefully for detonation under load. BUT!! If it is doing it when not hot or no loads have been applied then you are being duly warned by the engine that you need to do something now, prior to ruining it due to detonation. Cooler plugs? Maybe. Hot spot in chamber that can be fixed? unlikely. Better fuel needed? Most likely the problem. The cost of upgrading compression ratios in old tractors running todays junk fuel is you need to run mid grade or high test gasoline.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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