An improperly tuned engine will cause that. Weak spark, worn plugs, points out of adjustment, frozen centrifugal advance, worn distributor bushings, clogged air cleaner, valves out of adjustment, vacuum leak, anything not right can contribute or combine to cause loss of performance. Save the carb adjustments for last. If the rest isn't right, the carb can't do it's job.
Easy test of the governor, engine off, set the dash lever to full speed, look at the position of the throttle. It should be in the wide open position. Then start the engine, move the dash lever from idle to sudden full throttle. The throttle should instantly go to wide open, then modulate back as the RPM comes up.
Since a little choke helps, it could be too lean. With the engine up to operating temp, try opening the main jet 1/4 turn, then try the sudden throttle. It should take full sudden throttle without hesitation. Keep backing out the main adjust until it will. A single puff of black smoke is the goal.
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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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