1999 "EE" Evinrude 5 thru 15 4-Stroke Service Manual, P/N 787022, Page 31Get this manual

1999 "EE" Evinrude 5 thru 15 4-Stroke Service Manual, P/N 787022, Page 31

Rated Power
Hot Weather High Altitude

Weather, Altitude, and Engine Performance
The horsepower ratings of all engines are those that would be obtained under standard conditionsHowever, changes in weather and altitude will affect the performance of any outboardSome factors that will decrease the output of an engine are: Low barometric pressure High temperature High humidity High altitude