Sounds like your boat is newer, but not wanting to assume, is your motor oil injected? If so go with a 4 stroke kicker. Nissan does make a great motor and I believe they are all 4 stroke motors. If you buy a 2 stoke and you main motor is 4 stroke then you'll have to have an external tank and mix your oil. It'll be a pain. You can run an oil injected 2 stroke main motor and a 4 stroke off of the same tank. That is how my boat is set up. And it works great.