I was idling the engine as I was tuning, adjusting the valves and getting all the "bugs" out. Thanks I will look into the plug cleaner, but I've heard these plug cleaners can leave blasting media or glass beads in the tight areas of the plugs that are very difficult to remove. Will check the idle mixture screw again with a vacuum gauge and see if I have it a little rich. Float level should be OK as I checked it and double checked it when I rebuilt the carb.
Tim
