I've got an 05 wr450 and about 2 days ago while heading home on it the back tire just locked up. I was about a mile from home and was wide open in 5th gear on a dirt road. I hit the clutch straight away but it had no effect at all. The enigine is fine and it starts no problem with the electric starter. Yesterday I went to start it and the battery was flat so I kicked it and nearly broke my foot, it seems that is solid now and won't start at all now. Just wondering if anyone else has had similar problems. I don't want to start tearing it down till I have a little bit of an idea of what I'm in for. Advice would be much appreciated.