Other 1983 XR350R

I have a 1983 XR350R and I have installed a new timing chain from XR's only. The brand is k&l supply. After three rides, it started making noise and when I opened it up I saw the tensioner at full max and the chain is loose. How can this chain have stretched so quickly? Is it a poor quality chain?
 
When I looked up the OEM chain for a 1983 XR350R, it said the part 14401-414-014 is discontinued. So, I googled that part number and got a page on ebay showing a replacement chain that says it also fits a 2006 - 2015 CRF450R. Not sure if the Honda OEM 2009 CRF450R cam chain would work on your 350, but if you want to try it, the part is on Revzilla:

The eBay page where I saw this:

I just don't trust aftermarket parts for an engine.
 
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