Originally Posted by
DJ_Shakespear
With the mid needle, all I know is that stock is 99% of time fluch with the carb body.
It would be interesting to read up about the mid-speed needle, all I know from past reading is that you shouldnt really mess around with it unless you are a tuning pro! I have, and it did seem to have an effect, especially the bottom end, but I never really went more than a few hours.
In a simple explenation it is just a LSN......
More advanced with this screw you can position the spray of the fuel into the airflow. The center of the airflow is depending how much the carb opens so you can optimize the mixture at a certain carb opening.
Most people probebly do not notice much but it can change some midrange RPM characteristics to the engine.