The 1975 year model, 100 hp Evinrude, requires a 50:1 fuel to oil ratio.
The 9.5 Evinrude Has a 50:1 Ratio Oil Mixture
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The fuel oil mix for a 1979 100hp Evinrude outboard motor is typically a 50:1 ratio, which means you should mix 2.6 ounces of two-stroke oil per gallon of unleaded gasoline. It's important to use quality two-stroke oil designed for outboard motors to ensure optimal performance and engine longevity. Always refer to the owner's manual for specific recommendations and guidelines.
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50:1 all of the Johnson evinrude up to 1963 when they changed to 24:1
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 88 hp Evinrude, all models, requires a 50:1 ratio.
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.
The 25 hp Evinrude outboard has been designed to run a 50:1 ratio, for earlier models, and 100:1 for late model engines. Pre 1965 models run a 24:1 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.