I have a question regarding my friend's (Ben) bike just because I'm a little confused and want to learn what's going on with this particular problem. So Ben's bike would basically not accelerate at high RPMs. We thought the carb jets needed cleaning and maybe they still do but let me finish the story on the bike first. So at high RPMs the bike isn't really choking or sputtering, it just doesn't accelerate like it used to. This weekend he took a 4-5 hour road-trip and the bike just died after a few hours while driving and then wouldn't start. He knew the battery was bad and replaced it and now according to Ben it seems to be running "fine" (whatever that means). My initial thought was that the stator or regulator is going bad, my reasoning being that presumably the bike isn't providing enough power of its own to make a good spark hence the reason it died while running. But I was thinking more about it and maybe if the battery is dead it begins to act like a short, thereby draining most of the power being generated by the bike? I guess I'm not entirely sure how batteries behave electrically when they die. Also once the bike is running you should be able to pull out the battery and the bike should keep running on its own power right?