If you are referring to the oil light between handle bars. That means you oil pump is not working correctly.
yes
i have a 2002 Yamaha blaster and i use castrol 10w-30
650ml
32:1
low oil
2-sroke
Yamaha's Yamalube, 2 stroke oil is a good choice.
its a 2-stroke, you keep adding oil
a good quality 2 stroke oil
Yamaha blaster does not have reverse
Synthetic lube
Yamaha's Yamalube, 2 stroke oil should work pretty good