You're here for help, which is a good thing, because we like to help.
But from your description of things wrong and things you've done, it seems there's a lot missing from this picture. Flat out on the highway is neither a repair nor a diagnostic procedure, and while the XX is a strong bike, if there's something wrong, it rarely fixes it by itself. Your mention of the valve adjustment is the clincher to some degree.
If you're experienced mechanically, then start with the basics and work forward from there, as is appropriate.
If you're not experienced mechanically, then take the time to learn if that's your desire, or get the bike someplace where they will address the issue rather than taking potshots at the problem.
No flame intended. We'd like to help you, and it seems as though you've done some things with it, but either your approach or your relation of the story is a bit haphazard.