My 222 came with a log book written by the people who named her 10 years ago. When they bought her she came with a 4 hp motor, and they wrote several times in the book about how absolutely underpowered and slow it was and how much they hated it. This, on a lake that is very sheltered. They traded it for an 8 hp sailmaster (which it still has) and almost sang about it.
I couldnt tell you what a 4hp would be like on that boat with any personal experience, but I can tell you the 8 hp is plenty powerful, and throttled back moves along quite smartly, smoothly and somewhat quiet. By comparison, a 4hp would be likely be wound up pretty good and making some noise to do what the 8hp does at part throttle, and you would have no additional power for headwinds.