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i have a 1975 9.9 and would like to make it into a 15 hp, i know they have the same specs. do you recommend prop change or carburator.   thanks, gilla.

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I would change the carb to 15 hp model and check wot rpm. should be 15 hp @ 6500 rpm 10 hp @ 5500 the increase in rpm is evinrude trick to increase hp. the increase in air fuel mix work together to increase hp.  any questions call 631-514-1525 thanks Ralph
Ralph, The Outboard Wizard
Owner, Lindenhurst Outboard Service Inc. since 1979 +
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