Manual recommends Yamalube 4, 10w30 engine oil for the gearbox.
Any 10w30 four stroke motor oil with no friction modifiers will do.
Some people have great succuess with ATF type F.
You can purchase specific gear oil for motorcycles with wet clutches.
Drain old oil, and refill with no more, no less than, 650ml of fresh oil.
As to 2 stroke oil, one question will return 20 or more different answers.
It must be designed for air cooled motorcycles, and not weedeaters, chainsaws or outboard motors.
Recommended premix is 32:1, unless the maker states different.