Re: Is 40hp enough for KW 1520?
Back in the '60's, the OMC twin cyl. 40 would run a reasonably light FG 14-15' semi-V 27-30 mph with 2 folks and gear. Used fr-in-laws on several occasions. 25-27 mph is a nice respectable cruising speed and fast enough to enjoy being out on the water.
HTH,
Mark