Dirtbike engine making a clanking kinda sound?

its a honda crf100f, when, i start it, its fine, but when I go to rev it, and the rpms get higher, theres a metal sound in there, not really sure how to describe it, like a really fast vibration sorta, but its metal on metal, could low oil cause that?

I havent done an,oil change for 6 mobths but the oil is still clean in it and I forgot what kind of oil it took.

Read more: Dirtbike engine making a clanking kinda sound?