I checked the slack just now actually, using the video you posted jkv45, the lubed chain got rid of the growl, and part of the chain is stretched. 3/4 of the chain is at about 40mm but one section is about 50mm. My guess is improper care of the previous owner killed the chain. When I got the bike the chain had about 70mm of slack, I doubt it was ever adjusted before.
So looking around a very popular chain and sprocket combo would be the RK XSO, any other suggestions? I can get the chain, both sprockets, and the chain tool for roughly $170.
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