Thanks qwerty - this post is very timely and I'll be following it. I threw my chain a couple nights ago and it took me about an hour to pull the rear wheel, untangle and re-assemble. At 11pm by flashlight in 90 degree, 90% humidity...
Manual says to adjust chain for only 1/2 inch deflection, which seems very tight - I can hear a new noise when coasting that sounds like it's coming from the front spocket, sort of a stretchy creaky noise that oscillates according to speed. Don't know if the chain is twisted from being sucked into the rear sprocket, or if it's just too tight. Adjustment cams are at approx. 7.2 by the stamped numbers.
So, it's likely time for a new chain and sprockets. Thanks again for sharing.