Here’s a copy of the tune-up data from a Johnson Condensed Service sheet, including recommended oil ratios, that I’ve always gone by. Evinrude wouldn’t be any different. There’s always a debate on the gas-oil ratio topic, but on any motor with bushings instead of bearings, I’ll run 16:1.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1957 Evinrude 3022
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
1982 Evinrude 25hp
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."