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 - Oliver 550 Purchaser Checklist - by Greg Sheppard. Pound for pound the 550 is better than anything I've seen. It has great power for its size and can really hunker down and lug. Classified as a 3-bottom plow depending on soil conditions. I personally don't think it can be beat for a utility tractor in the 40 HP range. They are extremely thrifty on fuel, at least my DSL is. Most drive train parts are fairly easy to get. Sheet metal is probably the hardest thing to
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