M_Boats: motors

It seems as if my back no longer likes lifting a 50 lb Honda 5 from the car to the transom of my M17. Has anyone out there used an air-cooled Honda 2 hp 4 stroke with success on such a boat? If so, what kinds of speeds can you cruise a few miles at, and what is the approximate fuel consumption at speed? I certainly don't want to run more motor than I have to. (Dave Scobie, I think you ran a small motor on Air Born in the San Juans, but I can't remember the details.) Thanks a bunch,) Tom Jenkins M17 Scintilla