Go Honda
I have a new 9.9 on my 23. The 8 and the 9.9 are the same motor with slightly different internals. There are distinct advantages to a 4 stroke, and Honda makes one of, if not the , best. 9.9 is more than my 23 needs, but it costs only slightly more, weights about the same as the 8, and has 20% more power. Supporting a 4 stroke is an issue that has been well discussed here. CVP