my peugeot speedfight 2 dose not start for some reason, i haved charged the battery full several times, changed the spark plug numerous times, and it has been in a garage but still comes out not working. when it dose work(use to work) it made a weird noise when u were riding it.wat could be the problem?????

Optional Information:
2000 Peugeot speedfight 2 70cc

Already Tried:
everything