Reg unleaded gas.
You haven't specified as to its year of manufacture, so if its older, as in a 2 stroke, it'll be a mix of gas and outboard oil.
If its a newer model, a 4 stroke, it'll be injected(Gas and oil seperate)
If you are totally unsure, Consult your owners manual and if you have none, then any Yamaha dealer can use the serial # off the motor to establish any specs on it for you.
Happy boating.
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