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.
Premium gasoline
100:1
Sure
Yes !
it is oil injected
50:1
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.
Most all models of Yamaha outboards can be operated on a 50:1 fuel to oil ratio.
one liter fuel 10 mill oil
50:1