Many of the smaller ones are all made by one company and labeled for each other.
I've tried a couple of the 4 stroke, single cylinders in 2hp to 4hp and got rid of em immediately because of the excessive noise and vibration. The little Honda air cooled is quieter but has has a damned centrifugal clutch so when I want to really troll slow, it's out of gear. WTH?
I've found none as good as my Evinrude, 1965 Ducktwin 3.5hp.