how can i fix my speedfight 2?

hi i was on my way home after spending 20 mins starting up my bike and after i got it started within 10 mins(and a long way away from home) it totaly died and have not been able to start it i have tried changing the spark plug and it IS sparking but still wont start and when i try to use my electric starter it just clicks and i realy need it to start so plz plz plz plz plz help me thanks tom