"Misting out the top of the carb even when fuel is shut off 'til it dies" would indicate a valve (or possibly camshaft) issue.
If an intake valve is set too tight, "popping back" through the carb will occur when the cylinder fires, on the other hand, if an exhaust valve isn't opening when it's supposed to, after the compressed charge is lit off, the exhaust gasses will "pop" back through the carb when the intake valve again opens.
A "flat" exhaust cam lobe can cause this.
First, check the simple stuff, firing order and timing, then run through the valve clearance setting procedure again, if OK, might as well check valve lift with a dial indicator to verify valves are operating as they are supposed to. HOPEFULLY, you can find some valve lift "specs", but even lacking them, check and jot down the "lift" of each valve and see if any deviate from the others.
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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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