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    What speed should I get with a 1986 Procraft Competitor w/1990 Yamaha 150 ProV

    What speed should I get with a 1986 Procraft Competitor w/1990 Yamaha 150 ProV. I do not have a jack plate installed yet.Running a 21pitch Laser11. Now running about 51mph.GPS at 5500 RPMS. It ran 47 mph with the previous 115 Yamaha on it. Is a jack plate goin to make a big difference?
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