I have a 1990 EX500 and I pulled my bike out of storage the other day. It was stored with gas stabilizer and removed the battery for the winter. Poured some new gas in the tank attached the battery and it started right up. I was driving it around and it sounded great. I turned off the bike and a few hours later I went to start it again and it sounded like it was going to start until I heard a pretty loud knock. It was on the center stand (not sure if that matters). Now it won't start. It has plenty of battery life. It won't even turnover, just clicks. Appreciate the help!