Thats one of the great quirks of the bike. Think its how they set it up with the exhaust and the emissions. Always loved to decelerate and hear it back fire from time to time. There is a way to stop it. A mod they do to them something about a white spacer in the carb. I would have to do some research and get back to you once I found the post. I always liked the quirk of the bike and never bothered doing the mod to it. :lol: