I took my 08 wr450 for a ride today and got about half a mile and it got boggy than finally died when i pulled in the clutch. I stoped looked it over and kicked it over again, got about the same distance before dying when i pulled in the clutch. I finally got home doing this. Heres my guess. I havnt changed anything on the bike in over a year(aside from maintence) but my battery has been dead (unable to use E start or blinkers when not on) for a while now. my electrical setup is not perfect yet( bike wont charge battery very good while riding) so can your battery go low enough for the bike to be unable to run? Its not running hot or anythning either.