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Hi Anthony, welcome!
My guess is that you're losing spark to one cylinder occasionally, but that's only a guess at this point. It might be worth taking a look at the plugs to see if you can see anything that gives you a clue. Also check the connections at the coils and plug caps.
As far as the noise, a video would be helpful. Is your chain well lubricated? When the rollers get dry they can make a rattling sound at some speeds.
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