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50/1
As far as I know is 50:1.
The Mercury Tower of Power, (6 cyl. in-line), 115 hp requires a 50:1 ratio. This is roughly one pint of 2 cycle oil, to six gallons of fuel.
The fuel to oil ratio for a 2000 model, 25 hp Mercury outboard, is 50:1. Use one pint of two cycle oil, to six gallons of fuel.
The 1978 model, 115 hp Mercury outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1976 model, 115 hp Mercury outboard, 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 use of 4 stroke type motor oil is not recommended, nor intended, for fuel / oil mix.
If not using oil injection, the 115 hp Yamaha outboard will require a 50:1 ratio.
The 1979 - 1980 model, 115 hp Mercury outboard, requires a 50:1 ratio. One pint of 2 cycle oil, to six gallons of fuel.
If running without oil injection, a 50:1 ratio is required, roughly one pint of 2 cycle oil, to six gallons of fuel.
A 175hp Mercury outboard requires a 50:1 fuel to oil ratio.
I have a 1976 Johnson 115 and the ratio I use is 50 to 1. Rob, Dallas, TX.
The 1977 model, 20 hp Mercury outboard, requires a 50:1 fuel to oil ratio.