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There are many choices for oil. A safe bet would be Yamalube4, 20-40 for summer, and 10-30 for winter. Your engine and gearbox use the same oil, and your yamaha dealer will have Yamalube.
NOOO!!!!! Do Not put the motor oil into the fuel injetion. For the gear oil that is wha you would use but you need 2 stroke for mixing with the fuel. Make sure it is injector safe