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honda crf450r dirt bike clunking noise

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my 03 crf450r dirt bike is making a clunk or clank noise when its on low rpm or needs to be down shifted after that the noise subsides. seems to be coming out of the engine but not sure can anyone help me. also the bike runs fine per say has good idle and power but no sure how it feels bran new because i bought the bike used. open to any comments

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Is your chain tight? Sometimes I hear loose chains do that when lugging, I know it sounds dumb but...

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Do you hear noise when the bike isnt moving? If not its probably is your chain just as nutbar suggested.

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my chain is a is a lil loose but the noise is extrmly loud and yes the bike makes the noise wen its moving but only on low rpm or into high of a gear

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does the engine make noise when the bike is in neutral, and not moving ? if no noise is heard when bike is idling in neutral, its a loose chain..

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Tighten your chain up. The entire drivetrain unloads once the power stroke is completed, and if your chain is too loose it will slap the swing arm when this happens.

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