Honda 1986 cr125 leaking oil?

I traded an old car for this dirt bike and I've been riding it for a few months now and it's been leaking oil from a hole that is underneath the gas thing. I need to find out if that hole is supposed to be there or not and how to fix this. Thank you.Honda 1986 cr125 leaking oil - 1

It's a leaking oscillation adjustment screw, just tighten it.

Mike, there's a hole in the engine(it looks like it's supposed to be there) and that's where it comes from and I can't seem to find anything about it on google.

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