Ok about a month ago i bought a 2004 CRF250 and it has all sorts of after market parts like white bros exhaust and high compression piston. I finally got the starting of the bike down because its harder but sometimes like after a fall or i dont put my bike into neutral when i turn it off it wont start up again for like 15-20 mins of kicking it. I called the guy that i bought it off of and he said he didnt ever have a problem with it and said it might be flooded. so i turn the gas off tip the bike over and let the gas drain out of the carb and it still has trouble. Is there something wrong with the bike or am i doing something wrong i do all of the maintenance things like air filter cleanings chainlubing etc.?