you will hear a lot of noises however most people never mention that noise. I've never heard it on my bikes or any of the one's I've worked on. I would have at least checked the oil pressure. but that's me. the cct in your R6 is not like the 2nd gen that used a spring. the 3rd gens use one that's operated with oil pressure. if the pressure is low, the CCT will not have much tension. that's why I thought it was the CCT because the 06/07 were known for low oil pressure at idle. thus the cct was "soft" until you give it throttle to apply more oil pressure as the oil pump spins faster with the RPM of the motor supplying more pressure.