1978 Polaris RXL Service Manual, Page 75Get this manual
GL OSSA RY (Con' t, Venturi :
An area air co nstrictionA ventu ri is used in ca rb ure to rs to increase velocity pressur (speed air flow) wh ich decreases sta tic pressure (lowers pr essure in venturi to be low mos phe ric pressu recausing fue to be pushed th rough jetsetc and into th venturi to be mixed with air and fo rm co mbusti ble airfuel