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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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