I JUST PURCHASED AN 1981 EVINRUDE 115 AND NEEDED TO KNOW THE FUEL/OIL MIXTURE. IF ANYONE KNOWS I COULD SURE USE THE HELP.
From the Evinrude website:
Q - What is the fuel/oil mix for my motor?
A - The following is generally true: 1958 and prior used 20:1, 1959 thru 1963 used 24:1, 1964 and newer use 50:1. High performance usage (racing) requires a ratio of 25:1. New engine break-in (not DI) requires 25:1.
 Hope that is helpful.
Joined: 2008-07-13