Hello fellow XS650 enthusiasts, I am having an issue which I don't know what causes it. My 1981 xs650 vibrates like crazy. I have just finished another tune-up: adjusted cam chain tensioner, adjusted valves, tried adjusting timing with a newly bought strobe light and realized that my model has electronic ignition , and synced my carburetors. Even after all this, bike, when revved to 3k rpm, vibrates so much that it starts moving on the center-stand. Is that normal? I am not sure what causes it. Any advice?