Re: 1979 85 hp evinrude gas to oil ratio?
TCW3 is the current spec for a two stroke outboard engine oil. TC = two cycle W= water cooled. 3 is the current spec, the previous one was 2.
Would not hurt to run 40:1 but not necessary
50:1 is near enough 1 pint in 6 gallons
20ml per litre if you are where litres are used. (The rest of the world outside the USA)