I recently purchased a katana 600 ´01. It has very few miles (1500) and ran great for a bit. I was riding on the highway and it cut off on me. I pulled over and let it cool for a bit. It started right back up, so I just went with it. The next day, same thing happened, but now the ignition wont even turn over at all. Any suggestions on what caused it or what part to replace it with?