i recall hearing something about these bikes being known for cam chain noise? could that be what youre hearing?

 

Sorry for the delayed response. Most likely the cam chain. I had a a dirt bike that did the same thing. I gave the bike back to my Dad with the full manual. It's up to him now. Lol. I don't think it can be adjusted. Probably have to replace it. Hopefully he can figure it out. Thanks everyone!