Rattly sound at low rpms

[Veckymoto]

Recently my varadero has been having a kind of ratly sound in low rpms (I think), most noticable when im decelerating at roundabouts for example. It comes from the right side of the engine, and kinds sounds like bolts being shook around in a metal container? Its a weird sound to say at the least, bikes still runs just fine. Any ideas?

[S Barker]

Worn chain ?

[atimofejev]

On the right side of the engine, you have oil and water pump, but that shouldn't produce rattling and clutch, which might be.
It there any change in the sound with clutch pressed?

Most likely, you have something loose and rattling in exhaust pipes or silencer.