First, there should be a capacity/max HP plate on the boat.
Second, not all 14' ( or any size) boats are rated the same. Depends on many things.
Can you provide more details? Manufacturer? Year/model? Freeboard?
A review of my old Starcraft catalogs shows a max of 20 HP for a 14' V-Hull Utility with a 5' beam. Those with side consoles are a bit higher and deluxe models with wooden "floors" are a bit less.