if you are going new 4 stroke, I'd look at the 150 Yamaha or the 150/175 suzuki. they seem to be a popular choice for bracket conversions on SeaCrafts and they apear to perform well in those applications. If you are not going new, you can't beat a V6 carb merc for power to weight, properlly set up, teh 2.0L and 2.4L are even fairly efficeint on fuel. Look around, there were a bunch of 150 Yamah 2 strokes sold about two years ago(the last gasp of the carb 2 stroke), you might find a NOS sitting in a dealers inventory. If you are thinking 200+ four stroke, I don't think the Yamaha 200/225 will be satisfactory, its a lot of weight and they don't have a lot of umph.
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