Thanks for the input, I ran the engine twice more after I posted this thread. I found that the bubbles appear from idle to around 1/3 throttle. At W.O.T. it makes bubbles except they are almost unnoticeable. I do run a pressure tap off of the muffler. If I understand what you mean about looping the fuel line, I should use a longer piece of tubing between the carb and the needle and loop the excess?
-Thanks Tom