I can personally verify that Merc makes a 2.5 liter 200 HP V-6 and they run like a champ - even when modified. I might suggest that it's alot of power for kids though. My 18 year old son with lots of boating experience still isn't allowed to take mine out on his own. I would suggest maybe a 150 - 175 HP motor would be a great choice for the hull. Then again, what's the Capacity Plate and / or the manufacturer recommend?