Does the rear sprocket on the S2R suppose to have a slight amount of side play? While cleaning the chain, the sprocket appears to have a little side play. I figure it might be that way because of the single side swing arm.
My AFAM quick change carrier is actually kinda sloppy loose side to side on the cush drives. It was that way when new. I was concerned about it and contacted AFAM. They suggested that was "normal." : The stock steel sprocket was snug by comparison.
Anywhooo, I don't really think it's a big deal because the sprocket "locks" on to the cush drives when under power and kind of finds it's own center when backing off. A chain drive is not exactly a precision mechanical set up.
I guess I'd prefer a more snug fit, but FWIW I've done probably 5,000 miles on it in the sloppy loose configuration with no ill effects and it doesn't seem to be getting any worse.