Hi I own a 2001 XR650R. It is completly modified and uncoked. I have had no problems with the bike to date and use the bike everyday. This morning I started the bike as normal. But the bike would not idle correctly. I tried turning up the idle screw, but the bike kept dying. I started another 2-3 times, then nothing. I have checked the plug and there is a spark. I noticed the high tension lead was loose and retightened it. Also the yellow boot is broken at the top. After many attempts and a huge shot gun backfire the bike started. I rode it around the block and it was going great and then it died. I have not been able to start it since. Any ideas would be hugely appreciated.