Does the governor arm move freely? They can seize up if the tractor has been sitting a long time, especially outdoors.
If the governor is pulling the throttle shut, you need to adjust the idle stop screw so it can't.
BTW, buying a new carburetor is a waste of money, unless your existing carburetor is missing, damaged beyond repair, or the wrong one. There is nothing to "go bad" or "wear out" that doesn't come in a carb kit and can't be replaced.
Problem with buying a carb and having it shipped to you is the UPS people drop it, throw it, kick it, shake it, smash it. By the time it gets to you 9 times out of 10 it needs to be pulled apart and rebuilt anyway. Save yourself some money and rebuild the one you have next time.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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