my 07 has 2800 miles on it. And on Monday i changed out the front sprocket went down one in the front. And kept the stock rear sprocket and chain on because they are still in good condition. now i notice when i am cruising down the freeway in 6th gear around 75mph and let off the throttle and just let the bike decell on its own no brakes i am hearing this faint howling sound. Kind of like the sound a lifted truck makes with mud tires but really quite. Never heard the sound until i put the front sprocket on.