I did the Sea-Foam soak the past couple days. It seems to have worked. While the carbs were soaking I checked the plug wires and found one end bad, so I put all new wires on and cleaned the ends. I moved the TCI to the top of the airbox and cleaned the contacts. Its firing on all four now. Seems to be runnng fine now but still no idea what the air sound is or where it is coming from. This site is the BEST... Many thanks to Yammer-Dan