ok i have new 07 rappy. and have about 6-8 hours on it.. now when i first fire it up it runs like crap and looks like it blows a little black smoke. then when i ride it , it likes to back fire thru the exhaust when you shift from 1 to 2 gear. the valves havent been adjusted. also the exhaust is getting a raspy sound to it is this normal. and how often should the fan come on. since ive had it i hear it comeon once and i have checked the connectors under the seat..... and you would think the first valve adjustment should be done under the warrenty and not out of pocket.. please help. and i warm it up for about 1-2 mins till i ride it..