If so it probably only has an idle mix adjust, or an idle speed screw, or neither.
There is a way to adjust the full governed speed, but that's best left alone unless there is good reason to go there, as in the engine has been apart or something happened to the original setting.
Common carb problem with those is lean surging from dried ethanol deposits in the main jet. The solution is to remove the jet, which I think is in the nut that holds the bowl on, but it can be up inside the stem above the bowl nut. It will need to be scraped out with a stiff wire, flushing with carb cleaner will not clean it! Be persistent, scrape and poke it as thoroughly as possible without actually enlarging it.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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