my aprilia keeps cutting out?

hi im woundering if anyone can help me, when i start my bike up i have to use kick start and when i rev it its sounding fine, but when then engine gets goin abit i can hear a rattle comming from near the kick start and when i get goin the bike just cuts str8 out like somthing as stoped it altogever and i try to start it with the button and the battery is flat and kick start wont work unless i leave it for at least 6 hours then it will start and do the same again. can n e 1 help me plz