I have some play and I "think" I traced it to the rear part of the link just below the swing arm connection. when looking at the part and bearings they appear to be in new condition (no wear) which is why I am not 100% sure that is where it is coming from. Is that normally the location that play develops in the rear suspension or is there another bearing that normally goes out first? the reason I ask is (for example) on the Honda it is always the top shock bearing even though it may feel like the play is coming from another location.
BTW, this is on a 06 YZ250F and I posted the question on that forum, but not many people have had this issue and someone suggested I posted here. thanks for the help.