I have a 2007 that has been sitting in storage for almost 2 years. The other day I tried to start it. After a while it started but would not idle. I drained the gas tank and refilled with fresh. It started with the choke but ran rough and backfired alot. I replaced the airfilter and started it again but it still backfires on decel and will not idle without the choke. This bike has less than 35 hours on it and has always run perfect. I suspect it is something simple but I am not sure where to start. Any advice would be appreciated.