Home › Forum › Ask A Member › 18HP saga continues. Can’t get past 14mph and 3,900 RPM. › Re: 18HP saga continues. Can’t get past 14mph and 3,900 RPM.
I count four carbs total so my hat is off to you. You are really going after this thing!
As a word of encouragement, I will tell the story of a Mark 5 Mercury I have. Of course, it has a high speed mixture adjustment. One day, I put it on a 12 ft aluminum boat and dialed it in nicely, planing that boat off. Awhile later, that same day, I put the same motor on an 8′ Tiny Titan homemade hydro. It would barely plane the hydro off, it was so rich for that boat change. Leaning it out more for that boat made a HUGE difference. It planed off and went like an entirely different machine. My point here is that fixed jets are great but cannot possibly be right for every boat. Good luck.
Long live American manufacturing!