ok, i'll take a stab at answering your question..... imho and based on my experience owning a number of different makes with dry clutches, i do not believe it is requisite for a properly assembled dry clutch to be noisy when disengaged. certainly, a particular design, such as the GTR, i can imagine one would expect to hear noise on disengagement, however, if you know the parts are properly assembled, not hearing the rattle of disengagement, i would not think is something to be concerned about. a couple options i would consider, 1. disassemble the assembly, reinspect, reassemble and go from there. 2. ride it and keep a close ear on things, if all seems in proper working order go with it, or disassemble and reinspect. just my thoughts being completely unfamiliar with the parts of a GTR clutch, but being familiar with the internal workings of many motorcycles, having done many rebuilds, repairs, restorations.