What could this noise be?

Valves?. Cam chain tensioner? - There is a bearing in the cam chain tensioner. Does it do it only when cold and initially warming up or does it still do it when it attains normal operating temp?. Does it do it at idle or right through the rev range as you drive and change up to higher gears?.

When did it last get an oil change?.
 
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It's difficult to say from listening to it what area it is in, but check the auxiliary drive belt tensioner as they can rattle when they go.
 
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