Hi everyone ! I just buy this motor to put in my pleasure boat( 18 ft and 800 pounds) Im looking for some mods on my yamaha 60c . I have some ideas but i need fiability to. Im planning to shave the head (but how many thounsandth 0.000 ?) putting boyesend and vélocity stack to. Let my know if you can help my with some others tips... exaust , rev limiter, ignition, properllers ... Thanks in advanced guys for your answers ! David