I have a 08 yz450. I just had it rebuilt. Ran great for about 2 trips then out of nowhere I am just sitting with the bike running in neutral and it falls on it's face. Then I kicked it 2 times bike started right back up then after about 100 yards shut back off. I can start it up but it only runs for about 3-4 seconds Please help. I have a huge trip to Hatfield and McCoy tomorrow.