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If not using oil injection, the 115 hp Yamaha outboard will require a 50:1 ratio.
50.1
The mixture ratio for Yamaha outboards is 50:1 gas/two stroke oil. That is approximately one pint of gasoline to a plastic coke bottle cap full of two stroke oil.
The fuel mixture for a Yamaha 40 hp 2 stroke outboard engine is 50:1, gas, oil mixture. You should use new gas when you get the engine ready for the season.
20:1
My 2003 3.3hp outboard motor is 50:1 mixture.
the mixture is 50:1 I would use synthetic oil
32:1 gas to oil mixture
The 1997 model, 6 hp Yamaha outboard, requires a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel.
50 to 1 oil and gas mixture
50:1 gas to oil ratio
The ratio is 50:1.