Hey guys, I've had my bike for about a week now, and I've been hearing this backfire sound or a rumble sound coming out the back of my tailpipe. Sounds like my old CX650 when I adjusted the carbs too lean - no big bangs though. Anyone else get this? My dealer says all the F800s do this. Could this be a problem? I thought it was bad for an engine to do this. But it does sound mean and nasty. Besides that, this engine rocks!