The choke on my KX250 stopped working, in fact if you pull the choke it instantly kills the bike. It is impossible to start hot or cold with the choke on. I disassembled the carb and it looks to me that a press in brass ball has fallen out of the passage connecting the starter jet with the choke circuit. Looking at the attached picture does anyone know if the hole shown with the arrow is supposed to be plugged? Anybody have a good fix if so?