I run a Stiletto stainless on my 75HP (think it is a 21P) and have had no issues (Nitro 640LX). Have run it for about 15 years and never had a vibration. I wonder if the prop is out of balance.
About two of three years ago I started losing top end RPM and have no idea why. This is a traditional carb motor which I have taken to two different service dealers and they say the motor is running fine. I have a Stilletto 21in stainless steel prop on the motor and it used to run 5000RPM and...
