I too am thinking of a kicker for a 19' Bayliner. My thoughts are of something small enough to troll, but large enough to move the boat if the main motor goes down. It would suck to be out in some fairly rough water and not have a kicker big enough to get home with. I am thinking of a 10 horse 4 stroke. On a 15', I have seen guys using 4 and 5 hp motors for kickers.
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Organized people are just too lazy to look for things.