02 TTR225 Help!

[Humvee21]

I have a squealing noise coming from my TTR225. The noise is spontaneous, not constant. It will sometimes happen when I am trying to start it or whenever I am just riding along. Very unpredictable... Any help would be appreciated!

http://www.youtube.com/watch?v=GqncpyCie5c&feature=youtu.be

[SBA800]

sounds like ya got a bird stuck in the pipe