Four stroke single fires every other turn, or every 720deg of crank rotation. Two stroke twin fires twice per rev, or every 180deg of rotation. Huge difference. Four little hits compared to one big one. Small four stroke OB's are one of my favorite things to gripe about. Infernal beasts...
I would not want a four stroke with less than three cyl. Threes can be quite social, but not to be for a little dink.
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