Took your advice, and it's sounding great!! Disregard what I said about 800-900 RPM. Using this ACTRON Tach meter, I just dropped it down to the specified 500 RPM (via the Throttle screw) and then adjusted the Idle screw (counter clockwise, letting it out some) with an eye on the Vacuum gauge and I could see the dial going higher on the Vacuum, from 15 going up to 17-18 in/Hg with each turn I was letting out the Idle screw. Basically, as the Vacuum increased, (holding at 500 rpm), the engine sounded better and has a much quieter, smoother hum to it. Many thanks Jerry & Tim.
