50 HP Mercury, is that the four cylinder engine? I had a four cylinder Mercury and it would idle and run very smoothly. I liked that engine. Owners manuals and service manuals are still easy to find in print and especially in PDF form.
On a carburetor engine, I would stick to premium non-ethanol gas. Ethanol blended fuels need richer fuel to air mixture to be burn efficiently and you don't want to run 2 cycle engines too lean. If you are comfortable adjusting the carburetor or pay a mechanic to adjust it, that might work. Myself, I would stick with premium non-ethanol gas in an carbureted outboad.
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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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