125-200cc Rear rotor has play in it :/ help!!

Recently traded my 2002 Honda cr250r for a 2006 husky cr125 as I'm getting into woods riding and can not handle that powerhouse in the rift stuff. So far I love the husky, nimble, easy to control an love the smoother power band. Really enjoy the bike! The rear rotor on the bike has some play in it :/ the screws that go around the rotor 1 of them is missing. I'm hoping that is the problem and it's an easy fix, can someone fill me in? Is it supposed to be slightly loose? An if not where can I find the little screw for it? Thanks fellas, cheers!

i dont own your model but that sure looks like a floating rotor, so yes, it should have a bit of play.

Justintendo I read a forum saying its a floating rotor as well just wanted to check with you guys an make sure. Any idea where I can get that screw online though?

halls husqvarna

Thanks man