I recently purchased a 1999 14 foot pontoon boat with a 1983 35 hoursepower Chrysler engine. The reverse is going out and the marine shop says it will cost between $500 and $1000 to repair it. A friend of mine has a 90 horse power Mariner that he will sell for $800. Is this 90 horsepower Mariner too big for the Pontoon boat? The plate on the boat says it rated for 25 horsepower. Do I try to repair the gears myself or look for another engine? Help-I don't anything about boats.