Could be a manifold leak. If the intakes on the manifold are not sealed good then it will run rough as it is drawing air and not having enough fuel which is why it will only run on choke. Been there, done that.
Crank down on the manifold bolts a little to see if they are tight and try again. You can also spray a combustible along the gasket to see if the motor suddenly picks up revs from the combustible.
Same if the gasket at the carb to manifold connection is leaking.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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