I bought a 2004 Honda Crf250 used last year. The bikes kickstarted feels much stiffer than normal and it requires alot of energy to start. Once it does start it runs perfect. Then if i fall on the track or stop to take a break it will take 15-30 mins for me to get it started again. I always drain the gas incase of flooding but it still doesnt help. A guy i talked to said it could be some sort of valve problem. Can someone plz help me?