Re: Opinions 150 Johnson on 18.5 Boat?
Boat manufacturers are required to post a maximum safe horsepower on the capacity label for boats under 20 feet. The formula used is fairly conservative so even if the max is 150 you're good. However many manufacturer's actually downrate, that is, post a max that is less than what the formula actually works out to. So again you're good.
A force engine is a pretty simple bare bones engine, not many bells and whistles. But as was said they are old and parts are getting hard to get. Many years back when Brunswick bought Bayliner and formed US Marine they also got Force along with the deal. Force was made by Bayliner. Brunswick also owns Mercury so the newer force engines were actually mercs under the hood. So depending on when it was made the Force may actually be a Merc.
Personally though I would go with the Johnson. Just my own personal preference.