Wow! thanks for the quick response guys, really appreciate it. tightened chain with my wife sitting on the bike, she's a bit smaller than I am, but close enough, Chain noise quieted noticeably. And yes..I use Blue lube on the chain, clean it with seafoam, (yes, its a fuel additive, but it also is a solvent, that is relatively safe for the o-rings.) New chain and sprockets are on the way, and will be installing them as soon as they arrive. Again, appreciate the quick response.