Rattling noise in dirtbike engine?

I posted here the other day and Im back with new info and updates.

I did an oil change that didnt help, the oil was low so I was hoping that would fix it

I dont know what it is, its in the engine though, I uploaded a youtube video so you could hear it, the metal rattling sound isnt as bad in real life as it is in the video but the camera picks it up easier but it makes it easier for the camera to hear.

Please help, what the issue is or could be thank you


Added (1). Also dirtbike is a 2009 Honda Crf100F

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