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I have a 84 johnson 40 hp On a 1967 13,3 boston whaler. When I take it out it runs good but just seems like i should be a little faster. it Maxes out at 3400
rpms. I beleave it should be 4500 to 5000. why is it not reaching max proformance. 150 lb of compession, two brand new ignition coils and...