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I've got a jackplate mounted Mercury L6 115 on my Montauk, and it will run over 50 with a 20" Mercury Laser II prop and 5800 RPM red line. You should be able to get more than 43 out that Yamaha 115. That is the realm of a 90 HP engine.
Over 45 MPH in a Montauk you feel like you are "flying"