my old R used to blow cold and didnt smoke much from one of the pipes and i am afraid it was my crank which Andy then replaced for me .
the clanking could be your dry clutch if you have one the R doesnt as standard but when idling my clutch (dry) sounds more like 'ting.....ting' than a clank clank, although i am no exspert it aint sounding to great for ya.
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MC21SP - Roth-tax
CBR400 - track
MC21R - sold
MC21SP - sold