I have a 24', 2006 Lowe pontoon. It has 25" twin tubes. The max hp placard rating is 115hp. Being an '06, I accept that to mean a 4 stroke motor is acceptable. It is also rated to 12 people.
The boat came with a merc 60hp, 4 stroke, Big Foot (CT). By myself, on an ideal, chilly day, I could push...