Emtb weird drivetrain sound

[ReAngel]

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

.

 

[K PierreR]

Likely greater than 116 links is needed

 

[Richard Henwood]

Hi and happy holidays
I might have a solution per chain rubbing noise. On the derailleur hanger between the two idler wheels is a metal tab that’s interfering with the chains route. Reroute the chain to the other side of the metal tab it it is touching. I happened to do this when I installed my clean chain and the LBS pointed out that I almost got it right.

 

[PedalUma]

You cannot use a 9-speed quick link on an 11-sp. The nine is too wide and with bump things along its path.