Complete assortment of 7 different diaphragm springs for vacuum secondary carburetors. The stiffness of the spring determines when the secondaries open.
625 Street Demon® calibration kits feature an assortment of metering rods, jets and step-up springs to fine tune to your application.Features:Primary main jet assorment of .074, .076, .080 and .082Secondary main jet assortment of .078 and .082Metring rod assortment of .056/.048, .058/.050, .058/.052, .060/.050, .062/.054 and .064/.056Step-Up spring assortment of orange, blue, yellow and silver spr..
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