That's what I was thinking. 4000rpms is the most I can get out of it. And if I trim it up I can feel a slight vibration and I dont remember it doing that before a changed to the 140 carbs.
I have a 98 model evinrude 90hp on a 98 key largo 166. The boat and motor have less than 50hrs on them since new. I've added a tac on the boat because it didn't have one. At wot trimming the motor up I'm right at 4000rpms at 28mph. I was told by a older evinrude/Johnson certified tec. That I...