50:1 if you are using regular two stroke oil, 100:1 with a good synthetic oil
The 1975 year model, 100 hp Evinrude, requires a 50:1 fuel to oil ratio.
The oil / fuel ratio for the 1977 model, 85 hp Evinrude outboard, is 50:1, roughly one pint of 2 cycle oil, to six gallons of fuel.
The 1971 model, 18 hp Evinrude outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
50:1 all of the Johnson evinrude up to 1963 when they changed to 24:1
The 1994 model, 2 stroke 15 hp Evinrude outboard will operate well on a 50:1 ratio. One pint of 2 cycle oil, to six gallons of fuel.
An Evinrude 25hp outboard, 1985 year model, requires a 50:1 fuel, to 2 cycle oil ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
The 1992 model, 15 hp Evinrude outboard would use a 50:1 ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.
The 1981 model, 70 hp Evinrude, requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The fuel mix is 24:1
The 1984 year model Evinrude outboard, if not vro equipped, would need a 50:1 fuel to 2 cycle oil ratio.
A 1973, 50hp Evinrude outboard uses a 50:1 fuel to oil ratio.
1:50