It Is Fixed! Read!!!
Thanks for everyone that responded... NOT
The problem was one of the four bolts that attached the cylinder to the crankcase was loose.
Strange, after five years, this bolt came loose all of a sudden. (This explains the sudden change in engine tone.)
I replaced all gaskets at the crankcase along with the crankshaft seal. I left the carb alone, since I identified the problem with the bolt.
For $10.00, It runs GREAT! Maybe, another five years!