I believe those are oil injected.
I'm with Jim on that. Should be a clear reservoir there someplace. Can't remember if it's under the tail or where.
If it doesn't have it, it has been removed. Then, I'd start at 32:1. You could add more and get more power (20:1), but you'd want to increase the jet size to maintain your air:fuel.
You just got it? How much? Hopefully a good price.