It ran like a scalded dog. In fact, it is too much motor for my boat. Now Im gonna trade it for a 15. It was so fast that there was nothing in the water except the prop. It is the first time that I have ever been scared to ride in a boat. At half throttle I was up on plane cruising at about 19 (GPS) and when I hammered it I was at 38 (GPS). I dont like going that fast in a 14 ft Richline aluminum boat. So if anyone has a 15 HP that they want to trade just e-mail me.