Here is words from Pe Reivers
04-20-2011, 03:47 PM
but will he swim in it?
The notch in the throttle plate, located over the idle jets will concentrate the airflow and provide better idle mixture, allowing the idle needle to close more. However, this also results in leaner midrange because then more air bypasses the idle jets. For some carbs, this is the cure for rich burbly midrange
The above is what I did to get rid of mid range burble. I enlarged the moon on the throttle plate just a tad.... .005 of a inch. It worked good. Capt,n