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Cycle World - - Fundamentals -

The name “Con­cen­tric” refers to the po­si­tion of the float, which en­cir­cles the main jet. When Tri­umph and BSA raced their Triples in 1970, they nat­u­rally gave them Amal’s re­spected, clas­sic GP car­bu­re­tors with re­mote float bowl. When un­pre­dictable fuel flow re­sulted, in 1971 the GPS were re­placed by these mass-pro­duced Con­centrics, which, by wrap­ping the float bowl around its main fuel sys­tem, made fuel de­liv­ery more con­stant. Con­centrics first ap­peared in 1967.

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