Is your current 2-stroke really old?
I'm partial to 2-strokes myself, the performance of the Yamaha you mentioned will be a bit better than the 4-stroke Merc. That being said, the Merc will be quieter and less 'fumey' smelling especially at idle.
I troll with my 50hp 2-stroke Mercury on occasion, it does the job. Although I know someone with the 60hp 4-stroke and it sure is nice and quiet.
If I had the choice I'd gladly replace my mercury with the same HP Yamaha. I used to have a smaller boat with a 2-stroke, 25hp Yamaha and it was an awesome engine
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