Used pontoon boat~looking to buy?

Sun Tracker is very popular. I have a neighbor on their second Sun Tracker. They got a "Party Barge", so it has the 4.3 engine with an outdrive. The last one was 24' with a 75 HP outboard. For a smaller boat, you'd probably not need more than 50 HP. The pontoon maker would have a rating on the stern so you should have to worry. Just look on the Spec. Plate to find out the Maximum HP from the builder.