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Progressiv gasroll helps to open the carb more quickley. For my own opinion the whole engine reacts more crisp. I designed this part for my own use in my Lambretta Jet 200 and I love that little modification.
Does fit models LI (Serie 3 after 1966), LIS (after 1966), SX, Jet 200
Mountinghole is 4mm for springpin, but I prefere drill bigger to use M5 screw. Thats street-philosophy, easy to stripe on the run.
For racing use only, no spaceship, aeronautic or F1 aluminum. :P