I have a 2008 crf250r. The bike has about 60-70 hrs on it, not very hard hrs mostly woods trails. The bike has always ran great. 2 weeks ago I rode about 60 mi of trails and probably started the bike 15-20 times that day with no trouble. Came home and washed bike. 1 week ago at the track, the bike started good 1st start cold. I warmed it up and about 1/2 hour later went to ride after track was prepped and it wouldn't start. I kicked till I couldn't 3 or 4 different times till it finally started. This happened for the 3-4 sessions that I rode. Came home and washed bike again. I took it out Thursday to see if I would have trouble. I did but got it to idle for a few seconds with no choke and gave it a lil throttle and it killed and hasn't started since. I cleaned airfilter, changed plug, and cleaned carb. All jets were clear, I tried to trace every circuit in carb and blow through and they seem clear. I even took mid section of carb apart and cleaned. It had some debris from the sealant used to put the o-ring on and cleaned it all. It still won't start. It fires 1 or 2 pops on almost every kick but won't start running. I have a friend with an identical bike that I will try to swop coil and ignition box. Any suggestions or direction would be greatly appreciated. Trying to get it running for an enduro this weekend. Thanks.