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Guide: SI Jetting Chart + How to Tune an SI Carb - Modern Vespa Adding go-fast parts like exhausts and performance cylinders usually requires "upjetting," meaning to install a larger main jet 2) The Atomizer -- also sometimes referred to as an "Emulsion Tube" or "Mixer Tube" -- Primarily effects the mid-range (1 4 to 3 4 throttle)
Carburetor Jetting 101 - Scooterworks USA, LLC Try adjusting the air mixture screw first (which serves as a fine adjustment tool for the idle jet), and if the problem doesn’t “adjust away”, change the jet size and try again