1968 Evinrude Speedifour, Starflite 85HP Service Manual, Page 17Get this manual
LEAF VALVES There are four individual leaf block housings, one for each cylinder, but attached to common leaf plate baseEach leaf block housing has twin 4-segment leaf valves attached, one each sideThe entire assembly is mounted between the crankcase and intake manifold, and removed for inspection and repairsSee Figure 3-2 The carburetor is fitted with an automatic hot air choke to reduce the ratio of air to fuel for cold startsTwo choke valves, one in the air inlet of each barrel, are mounted to common choke shaftWith choke lever in the "OFF" position, the choke valves are held in fixed open position, allowing air to pass freely through the inletWith the choke knob in the "ON" position, the valves are held in closed position, restricting the flow of air to the carburetorFigure 3-3Carburetor and Automatic Choke
ALIGNING RECESS LEAF BLOCK ASSEMBLIES
FUEL TANK The fuel tank is non-pressurized, suction operated tankFuel is lifted from the tank to the carburetor the fuel Priming is achieved squeezing the primer bulb (part of the fuel line) several times or until pressure required to squeeze the bulb increasesThe connector nearest the primer bulb must connected to the fuel tankSee Figure 3-5