I have just been informed that my 2012 cbr has burnt valves. He states the valve clearances were normal but compression test revealed a valve issue. He took it apart today and said that the valves were burnt and they need to go to the machine shop and another 8 hours of labor! When I asked what could cause this he said since the clearances were good the only thing he could think of is bad gas! I've put 15k miles on it in two years. It is a commute vehicle and gets a new tank every week! Have I been transported to another planet or is this a common thing with this bike?