Re: Cheap bad idea
It WILL get you on plane with the right prop. You'll be limited in your top speed. I rigged more than a few new 20' Seacrafts with 85hp V4 Johnsons, which actually only put out about 70-72 hp at the prop. Cruise at about 22, WOT of about 27-28 mph.
Likewise, I have seen a Seafari rigged with an inline 4 cylinder 85hp Mercury, as well. He had no problems, either.
These boats don't need as much power as everyone seems to want to put on them. They're fine with lots and lots of power, but they work very well with less, too.
I went from a tuned '92 Mercury XR4 2.0L producing about 190 hp at the prop, to my current 375lb 90hp Optimax. I have plenty of power. I can't run 50+ mph any more, but then, I almost never did, anyway.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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