Emtb weird drivetrain sound


New Member
Hello, so I have a trek powerfly 7 2017, I just changed out the cassette and chain. The chain is Shimano XT 116 links and cassette sun race mx80 11-50. My derailleur is Shimano XT with med. cage. So I am confused why my drivetrain is making this noise. I tried with my old Shimano XT cassette 11-42 but it makes the same sound. Can it be worn out jockey wheels? Or the quick link? It might be a bad quick link it's 9 speed. I will add an 11-speed quick link once it arives. The youtube link of the sound I am getting