rear sprocket?

[TrapZ400]

My local dealer installed a durablue axle a couple months ago so I don't know much about it. I noticed that there is a little bit of play from the rear sprocket. When I grab the rear sprocket and try to roll the quad forward or back the sprocket moves a little then the axle starts to turn. Could it be that the axle lock nut is loose? And how would I go about tightening it?

Thanks

[Thumper1220]

check the bolts holding the sprocket on and mabye the splines on the axleshaft

mine does the same thing and has been doing it for a couple months. it wont get much worse ive seen people on here that have been running it like that for over a year. dont worry about it