I was out starting my sled the other day, and as soon as i pulled the rope, actually the second pull, it backfired and then almost sounded lie a single cylinder dirt bike motor. Could this be a blown cylinder? Im really nervous because I dont have th emoney to fix it and we are trying to sell it. O, its a 99 XC500SP. I have not even tried to start it because I am afraid to. What should I do. I NEED HELP NOW!!!!!!!!