What type of motor oil would I use for a 49cc Honda Urban Express from 1982.?

If it is any consolation, the oil is separate from the gasoline, I believe its called an oil injection system,What type of motor oil would I use for a 49cc Honda Urban Express from 1982.?
for 2 cycle engine you use 2 cycle oil, available at any auto parts store.if in doubt ask at the counter what to use.What type of motor oil would I use for a 49cc Honda Urban Express from 1982.?
Honda makes an oil called GN2. It should be right around five dollars, it's what I use in mine as well as what I sell to my customers at Huntington Beach Honda.





Thanks!
USE SYNTHETIC FOR OLDER ENGINES