ok i went to motorcycle shop before my 3 weeks trip to LA. They did something called virtual analysis, which cost me $80. They said i need a new battery after the check up thing( I told them that my bike won't start sometimes) anyway, after 3 weeks vacation, my bike won't start. I used my car to jumpstart my bike. Now, the problem comes. My bike stalled when I was driving. Moreover, the oil light went on and off few times, and everytime it goes on I felt like a downshift or something. Can someone tell me what is going on?

 

I hope that you checked out your oil & so on 1st? Anyway, sounds to be like an electrical problem, like the regulator going south, or intermittent electrical fault. But the fact that your battery keeps going flat, sounds like the reg.