I purchased a new RIB that on the specs say 4 HP OB max. Can I put a larger outboard on it? A 6 HP weighs the same (Mercury). Reason is I've been told I won't be able to get on plane with the 4 HP if I need to.
Why would you believe what some strangers on an internet forum tell you, when you WON'T believe what the people who designed and manufactured the boat tell you? You really think that WE know more about your boat than THEY do?
Back when (ah, those were the good old days, weren't they?) I used to over power my inflatables by at least 5 hp and often 10, I had some pretty speedy little dinks. I also had some pretty dangerous little dinks and they rarely lasted more than a year or so.
I doubt the water LEO's will ticket you, but chances are you will be creating a monster. Certainly nothing you'd want to let a kid drive.