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Noise from drive sprocket / chain area

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When I'm at low rpm's in 2nd or 3rd gear and get on the throttle, there is a slapping noise coming from the sprocket / chain area. Chain slack is what is recommended. Any ideas of what this is and how to avoid?:worthy:

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Gray,

Good to know that this is a normal YZ 450 thing. I was riding with a group a few days ago at the track and they all mentioned that at lower rpms my chain was slapping around and appeared loose. I measured it and it was at 1.9 inches, when the manual recommends 1.8-2.3 inches of slack. Maybe they were just jealous that they were behind me all day and trying to get into my head?!

Thanks

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