What is the oil gas ratio for a Yamaha 250?

The oil-to-gas ratio for a Yamaha 250 outboard motor typically requires a mixture of 50:1, meaning 50 parts gasoline to 1 part two-stroke oil. This equates to 2.6 ounces of oil per gallon of gasoline. Always refer to the owner's manual for the specific model, as recommendations may vary slightly.