What´s up 280 ....bikerfool here ....how long have u been ridin just outta curiosity ?...me ? Haha dirt bikes since I was 13...sreet bikes since I was 19 ..I´m now 58..1 of my bikes a 1978 xs 1100 yamaha full dressed ,frame srtech an raked has 364,000 miles on it anyway sum tinging after u shut an air cooled motor off is normal especially if u were just whoopin on it ...hit me up again anytime if I could figure out how 2 post a few pic of my bikes i´d love 2 show ya ....later