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If not using oil injection, the 115 hp Yamaha outboard will require a 50:1 ratio.
The 4 stroke Yamaha outboard requires a quality SAE 10W-40 motor oil.
An 1986 model Yamaha outboard requires a 50:1 ratio, roughly one pint of 2 cycle oil, to six gallons of fuel.
50 to 1. Use good Oil
50.1
A non oil injected, 1990 model, 2 stroke Yamaha outboard requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
The 1997 model, 6 hp Yamaha outboard, requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
one liter fuel 10 mill oil
How do you change the oil in a 1967 3Hp Evin-rude outboard motor?
The fuel to oil ratio for a 2000 model, 15 hp Yamaha outboard would be 50:1. Roughly 1 pint of 2 cycle oil to 6 gallons of fuel.
50:1
the mixture is 50:1 I would use synthetic oil