Took the bike out for some top speed flat out runs.
Seemingly after the bike ran over some dirt/rocks, bike is making a rattling/grinding noise. Video:
I parked the bike and checked for loose bolts. All were tight except the exhaust header can be tightened a bit more.
Rev the engine in neutral and the noise seems to be coming from the engine. Sounded as if a rock was inside, but it was not making the noise all the time, and from time to time the noise sounded really bad as if something is grinding.
I also noticed the valve noise is getting louder with its ticks.
Anyone have any idea what is causing the noise from an engine with 30 miles on it???
This is when the noise started: