I've had a 2010 Speedster 150 (155hp engine) for the past 3 years. When I first got it, I could get it up over 40mph with one person in it. Now, with one person it maxes out at 30mph. That is with almost an empty tank of fuel and not much more than about 20lbs of safety gear and me in it (about 190lbs).
I read something on another forum about potentially the throttle cable needs to be tightened?
Does anybody have any other thoughts? Or is this just how it goes with these boats?