Something you can try, remove the idle mix adjustment screw, spray some carb cleaner in the hole.
Replace the screw, see if it will adjust. Be sure the engine is idling down around 400-500 RPM, otherwise it won't be running on the idle circuit.
The mixture adjusting screw is actually adjusting air bleed, not fuel flow, so turning it in richens the mix, out leans it.
If that doesn't do it, the carb will need to come off and be cleaned out. Usually they can be eased apart without having to buy a kit. Try that first. Spray out all the passages, poke a small wire through the idle jet, be sure everything is clear. The gasket is important, it must seal around the small hole beside the venturi. That is where the idle fuel is drawn up.
It's a simple carb, don't be afraid of it. Just work over a clear surface so nothing gets lost.
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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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