Need help diagnosing my bike. My bike has 33,642 miles. I had the valves shimmed in June, and I'm hearing what sseems like the exact same sound as before
(As I have agressive tenitis, interpreting sounds is difficult at best) Could I have fried them again, it is my daily transportation and recreation vehicle? The easiest way to describe it is when I Rev it, on the way down I hear a metallic tumbling of sorts. Any help would.be greatly appreciated.