Rock and Roll
I was pushing it hard along my local set of twisties up in the hills, and while committed through a corner I heard this very loud CLANG and felt the bike reverberate, but not through the steering or back end. I pulled over a few klick further on, and looked my scoot over, and in the same place as what nd4spdbh indicated I had picked up a dent, about 2" long and .5" thick. All I can say it would take one hell of a massive hit to dent a stainless tube like it was even if you used a hammer. There was also a coating of pulverised sandstone on the surface of the dent. I rode back to where it happened, but couldn't find anything. All I can think of was while I rode past a brick sized rock must have fallen from the cliff and rolled across the road, out of my sight, into the manifold, and then got knocked back off the road. If I had hit that rock with my wheels, I don't think I would have stayed on the bike as it would have smashed the front tyre and wheel. Weird shit can happen.