BBC-NI is live streaming the North West 200 worldwide.
http://www.bbc.com/sport/0/northern-ireland/motorbikes/The live streaming link will appear when the event is taking place. They don't do a good job making it clear when the races are actually happening so you need to dig a little. Road racing in Northern Ireland is amazing. The NW 200 streamed live on Thursday for the super sport, super twin and the super stock races.
The TT races coming up on the Isle of Man in a couple of weeks are on par but I don't know if they will be streamed live. I was there last year and can attest to the incredible experience. Going back in late August for the Manx classic.
The next racing is tomorrow morning starting at 10:00 BST (that is 4 a.m. CST!)
I may be watching, we'll see but it will be worth it. The super bike race will be run and I don't want to miss that