I just recently purchased a 17ft Lowe Roughneck 1752D mod V boat with a 50hp merc with jet. I am looking into getting a kicker to go on my boat to troll with. It sounds like 4 stroke is the way to go but am wondering what size? Is 5hp going to be enough? Another thing to consider is what if the big motor decides to quit. Should I get a kicker that can get me back up river(15hp)? Then weight becomes an issue because 4 strokes are heavy. I mainly will be fishing the Fraser, Nooksack, Skagit, Drano Lake. Opinions are greatly appreciated.