Wow, hard to say. In the first part, I started thinking pinched fuel line from not being careful lowering the tank after service. Now we're talking electrical. The battery is only used to start the bike. After that, the generator takes over all the electrical demands. After all this time the brushes may be worn in the generator and it's not charging so you're running on battery until it gives out. If the battery is bad it won't hold a charge. Generally, if you fully charge it and the voltage drops below 12.6 or 7 overnight all on it's own without any drain on it, then it's time for a fresh one. The battery is the easiest thing to test first. It really sounds like you need to check any wiring that could be chaffed. Could be an ignition switch, too. Again, wiring related. Try fiddling with the key while you're trying to start it, and if you do get it running, check voltage at the battery to see how the generator's putting out. I keep going to ignition switch. That or kickstand switch. GL!