1972 Evinrude StarFlire 125 HP Outboards Service Manual, PN 4822, Page 19Get this manual
OEseRI PTION
VENTURI INDUCED LOW PRESSURE
FUEL FLOW The fuel system consists of fuel tank, fuel pump, and two carburetorsThe fuel tank is non-pressurized, suction operatedA diaphragmdisplacement type fuel pump on the motor draws fuel from the tank and feeds it to the carburetors through fuel filterCARBURETORS Each carburetor is two barrel, Side-draft, float feed typeHigh- and low-speed jets are fixedThrottle linkage is synchronized with the distributor through an adjusting linkage
ATMOSPHERIC AIR PRESSURE
IDLE AND SLOW SPEED ORIFICES THROTTLE VALVECHOKE VA,LVE