I have a 1989 90 Evinrude on a 160 Freedom Four Winns boat, the boat is rated for up to a 120 HP OB.
As the bore and stroke is the same for a Evinrude 90, 100 and 110, what is the difference to get the additional HP from the same size moter? Can the difference be retrofiffed to the 90 HP?
Has...
