Yamaha 80cc dirtbike just dies.?

[Hellothere]

Me and my friends have a 80cc dirt bike at first it was running great but after a while the bike started to jump and stuff. After we kept riding it more, when we open the throttle it would just stop and go into a low moaning noise but would rev up after a moment. Shortly after the bike would not rev up again but it would just die. I'm thinking something is loose. but i could use some help. Please and thanks
With the tank full.....

 

[Jimmy Dean]

You have to put gas in the tank sometimes.

 

[leeman0234]

Could be that your carb needs cleaning out. It sounds like its not getting any gas at times.

 

[billy joel]

your definatly not geting any gas to your carbs, clean it out or clean the tubes. or you mite be outa gas.lol