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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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