So I have a bit of a hack broke motercyclist question here. I have an 05 Kawasaki Ninja ZX-6R 636 with 32k miles which I'm pretty sure has never had a valve adjustment. It runs great, idles fine, no issues with hot or cold starting. I can find an entire used top end for this bike with cams for quite a bit cheaper than a proper valve adjustment would cost me. I'm sure I could do an adjustment myself if I just have a used top end on my workbench. So my question is why in the world would I pay to have a valve adjustment done? Is there something I'm overlooking? Could burning out an exhaust valve damage the bottom end?