Camchain tensioner is one of the usual suspects...
Which version of the DRZ is it? (DOH, sorry just re-read that it's the SM version) Still, some DRZs come with flatslide carburettors (or have them retrofitted for performance), on some flatslides the slide itself sometimes rattles during idle. (Does the rattle change if you tighten the throttle - not putting it on, just taking up the slack in the cables?)
You say warm idle only? I mean, singles vibrate a bit and if there's a couple of bolts in need of tightening anywhere you could have some random bit rattling a bit.
It is preferential to refrain from the utilisation of grandiose verbiage in the circumstance that your intellectualisation can be expressed using comparatively simplistic lexicological entities. (...such as the word fuck.)
Remember your humanity, and forget the rest. - Joseph Rotblat
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