Hey all,
I was looking over my chain today and noticed that I had an broken o-ring hanging out of one of the links in the chain.  I believe it's the stock chain with only about 11k.  Anyway I'm new to the whole motorcycle chain thing; is this an "oh my goodness don't ride 'til it's fixed" problem, a "you can ride a little but change the chain in quick order" problem, or a "eh as long as you keep it lubed you're fine" problem?  I don't know how long it's been like that, but it's been ridden and hasn't exploded yet.

If it is something that needs replacing will I be ok if I stick to DID, EK, RK, or Tasubaki?  Any other good (+cheap) ones I've missed?
At 11k should I replace the front sprocket anyway?
520 110 link, right?

Thanks! 

If you pull the front sprocket cover off you may find more broken o-rings in there.  Keep it lubed, check it frequently for stiff links.  That's my $.02.

Not the end of the world again just keep it lubed a little more often and watch for stiff links, roller chains don't even have o-rings. But I'm running a cheap KMC o-ring chain I got off ebay for 40 bucks. It's gonna end up lasting longer than the original since the previous owner no doubt didn't perform much chain maintenance, original went at 14,000 miles I've got 12,000 miles on the new one and barely adjusted 3 times so plenty of adjustment left. Probably last me more than 35,000 miles, pretty good for only 40 bucks. Oh yeah another bit of advice is run your chains a little looser as they'll wear out quickly if overtightened. I keep my slack at about 1 inch while adjusting on the sidestand since chain slack should be determined at maximum deflection which is when the swingarm is parallel to the sprockets ie compressed.