m8 Clutch issues

Went ridin today and went to crawl over a small log and my sled would rev but wouldnt move. Turned out the belt fell off ( didnt break but just fell off the secondary), I found this really odd. I am clueless when it comes to clutching. Also the sled as about 1000 miles now and I think I can heer rattling that comes from the clutches( could be rattleing from anywhere tho). Is there anything I should check? Do you need to get clutches serviced? Thanks!

No one?

Thanks for the reply, the rattling I hear just at idle, also I pulled my secondary off and noticed there were no shims behind it? I'm thinking about just taking it in to make sure everything is aligned, or is there a way for a guy to do it himself?