When setting throttle into slow forward indent, runs very smooth..then gets a little rough...smooth again...etc. Is this normal? Asked mechanic at dealership, "I'm not sure" Any suggestions on what he should check?
I had a Yamaha F150 and never had any issues --- ran smooth and quiet, especially at slower speeds. You may have a little water in the fuel. If it is a newer motor the dealer should figure it out/fix under warranty.