I agree with Paper. If it were me....
I'd lean the bike over on its right side against a wall or something. 45 degrees is more than enough. Pull the left side cover CAREFULLY. I have not needed to replace the gasket on one of those covers YET...
Loosen the doohickey bolt and see if it moves, is broken, spring trashed, etc. If either of the components is broken [doohickey or spring], when you tried to adjust the doohickey by loosing the bolt at the bottom of the left side cover, you removed whatever tension was on the chain. That may be the reason you hear noise where you didn't hear noise before. If the doo is in one piece, you might try manually taking the slack up and re-tightening the doohickey bolt until you get a replacement.
And welcome to the forum Patrick.
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
[FONT="Century Gothic"][I]Sometimes your only available transportation is a leap of faith[/I] [/FONT]