I have recently repowered my 18ft Lund ProV with a Yamaha F90. I added the Yamaha Command Link Tach System that enables me to go to a Troll Mode. In the Troll Mode base RPM's is 850. Using a tach mounted button I can control those RPM's by 50's up or down. Lowest is 600. Engine runs smooth a silk. I use the boat for Lake Erie walleye. This engine will troll my boat down to .75mph gps speed and lower. By bumping up or down by 50's I can control the speed of this boat in all conditions. Into waves, with waves, flat water etc. Pick a trolling speed and I can tune right into it. Total control.