So yesterday while riding my 2001 250ex it suddely lost power and died after it blew white smoke from somewhere. I tried to start it back up and it will not start. I ended up pushing it four miles back to my shop. Its been needing new piston ring for a while but im not sure if that is the problem. It sounds like it may not be getting gas. Ive only got $500 altogether in this bike and id like to keep it that way if possible. What is the problem? Why wont it start? Thanks!