I had the same experience. See my post http://www.xt660.com/showthread.php?...excessive+play
I have not solved it yet, because I have broken hand, so I am not able to go to my dealer There are 3 bearing with excessive play: bottom bearing of the dumper, one bearing in the linkage and small play is in upper bearing of the dumper too. I am curious, how my dealer will react... The bike is quite new - 5km on the clock!