Reply To: Increasing the power of a 1963 Johnson 5.5 hp

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June 17, 2021 at 6:47 pm #240481
JOHN D.
Participant

    US Member

    It would seem that getting the maximum rpm at full throttle is what you may be looking for. How about starting with a lower pitch prop. Then carrying the least amount of weight overall. Non ethanol fuel may carry more btu’s per gallon. All in all, you may not notice much if any improvement unless there is another like boat to compare to.