My bike started to run on only the back cylinder last week while I was out for a ride. I have good compression on both cylinders. I have good spark on both cylinders. Pulled the carbs and had blown out and check for any dirt or anything, nothing was found in them. This problem happened once last year when i took it out of storage. It cleared on it own. I thought it was bad gas. Are there any known problems that I dont know or am I missing something? It is a 2006 with 2300 miles.