New member needing some help with identification

Just got this today, me and my friend (we're both 16) are going to try and get it up and running. We have no idea what model or year, I am guessing 90cc, but have no idea. If anyone knows anything about it, model, year, manual, anything we would really appreciate it. Even if you can't identify the model, any idea what kind of oil it uses? I would assume somewhere around 5w 40, but I really have no idea.

Thanks!