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Message: <blockquote data-quote="LarryMc" data-source="post: 358372" data-attributes="member: 13895"><p>You've heard right. The 60/40 Merc has a large series jet lower with a 6 7/8" impeller. The 60/40 Yamaha 4 stroke has a medium series lower with a 6 1/8 impeller. At one time I had a 50/35 2 stroke Yamaha with the medium pump and 6 1/8" impeller on a 1750 Duracraft. It would barely get on plane and the top speed with two people was less than 20 MPH at 5200 RPM. I swapped the Yamaha out for a 60/40 Merc and there was a world of difference, the Duracraft got on plane a lot quicker and the top speed with two people increased to 27 MPH at 5200 PM. Granted the 60/40 4 stroke Yamaha might do a little better than my old 50/35 2 stroke, but it would require a big jump in RPM to do so and I doubt that it would ever come close to a 60/40 Mercury with the larger pump and impeller.</p></blockquote><p></p>