Background: Bike hasn't been started in about 5 months. I had knee surgery last year which prevented me from doing any riding. So I fire it up tonight, took about half hour to get it to run, sort of. It sounds like poo, pops shoots flames out the exhaust and stalls out. I am attributing the running problems to old crappy gas. Now here is the Question. After it "ran", I noticed smoke steadily rising from either side of the side plates. Upon removal I noticed the exhaust had melted the airbox. The exhaust and airbox are both stock. Never had this prob before. Now what would cause that and also, should I replace the airbox?? Not a large hole, but still a melted hole. The bike is an 06' 450. thanks.