Inflateables are a P.I.T.A. when they are in solid shape. I dove Point Sur/ Monterey off one in '81 or '82. I was there for six weeks diving with a Navy guy. Had a blast in general, but getting back into the inflateable contraption was a no good situation to put it nicely. Yes, OMC was bought out by Bombadier and parts may be an issue. Evinrude/Johnson have always been pretty bullet proof motors. As mentioned before, SEAFOAM used according to the instructions and a new set of plugs will get the motor humming again. Mercury engines? Has anybody used one and not had problems with them? Theres a saying among these parts. You want to go fast, get a Mercury. You want to get home, get an Evinrude/Johnson. That still holds true today. Every single Mercury owner I know is complaining about his engine. The Evinrude will be fine. Good luck with it, but for a few dollars more, you could probably buy alot more boat. Just my opinion. Look into it.
Jim
Jim