TA,
I have been through the same analysis for a small outboard to be used on canoes. I chose not to go Honda because of the centrifugal clutch, and worry about noise because it is air cooled.
Weight is a big issue in the newer four stroke small motors, and small two strokes are no longer sold in the US for emissions regulation reasons I believe. But, I found a used two stroke Mercury 3.3 hp that weighs about 27 lbs I think. A similar four stroke is much heavier (around 40 lbs?). On a canoe or a kayak, ten or twelve extra pounds is a big deal. I'm not sure when Mercury and others stopped selling low hp two stroke outboards in the US. 2006 maybe?
Hope this helps.
Matt