i haven't rode it for a while so when i went out and try to start it up. it doesn't start. so i thought it was the batteries. so i got a new one. but i didn't use the new batteries because once i took out the old one i decide to try it again. because it looks like new. so i started it up and it starts. then when i try to rev my engine. it dies. -_- so i got oil and filled her up. and she started and everything.....then two days later. i went out and try to ride her again. but she didn't want to start. so ii took out the batteries and put it back in. then she started. then i turned her off and she dies. so i took out the batteries and put it back in again. and now shes working fine. so can any of you guys tell me wants going on with her? haha i'm just afraid if i go out and ride her again sometime this week she'll die on me if i stalled.

Man, you are a drunk ninja 

vaccum or fuel problem?

do not know. explain to me both. and the Buddha Loves You isn't starting up again. i am going to change her batteries tomororw.

did you put a voltmeter on the batteries? while its not running and while its running.

how would that help me fix my bike?

will show you if your chargin system is working. when its running, does it run well, ie could you ride it as you normally would?