This is something I did not know. This information:
A) is Awesome because I found out before running the O-ring chain I just put on my 500.
And, B) Sucks because I just installed a brand new O-ring chain!
The good news is that I never started the bike with it on there and the company I got it from is going to work with me on an exchange.
Also, I'm having some clutch adjustment issues. The O ring chain I have is nearly a 1/4" wider than the non O-ring chain I have in the garage (from my Yamaha, but still...). Now I'm anxious to remove the side cover and see if the chain is interfering with the clutch actuator arm in some way.