I'm new to this forum and this is my first thread post. I just bought a brand new 2011 zx6r that was on a redtag sale clearance. This is my 3rd bike but it's been 8 years since my last 600. I know that the break in of a bike should be taken with some caution (don't redline it, go through the gears coming to a red light, etc...). I have been pretty careful on this break in but I now have 540 miles on it and I'm hearing like a flutter noise which I cant tell is coming from the valves or near the headers. I also noticed a loss in acceleration power in all ranges of rpm. Suggestions? There were two trips I took to work which are 30 miles each way and I was doing 80 mph at just under 8000 rpm. I hope that didn't do anything to the engine and caused something that should need adjustment. Any opinion or thought on this matter is welcome. I am taking it to the 600 mile service next week and will have to bring this up.