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Remove the choke cover attaching screws and reatiners. Remove the choke cover and thermostatic coil assembly from the choke housing. Remove the choke cover gasket and baffle plate. remove the fuel filter inlet nut, gaskets, fuel filter, and spring. The choke valve and shaft SHOULD NOT be removed unless the shaft is binding or the valve is damaged. To repair this type of damage, file the choke valve screw staked ends level with the choke shaft. Remove the choke valve plate retaining screws from the shaft. Lift out the plate, the then slide the shaft out of the air horn. The shaft is removed by first rotating the shaft to remove the piston and pin from the choke housing. Remove the choke housing from the bowl cover by removing the attaching screws and gasket.
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Remove the choke rod retaining spring clip and rod from the choke shaft lever. Unscrew the vacuum tube connector nut from the choke housing. Remove the bowl cover screws, and then the return spring bracket. Life the cover straight up to prevent damage to the floats.
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With the cover up-ended, remove the float hinge pine, the floats, and the float needle. Remove the float seat and gasket. Remove the main well support, vacuum power piston, and spring, and separate the gasket from the cover. Remove the main metering jet and power valve retainer. Take out the spring and ball from the main well support.
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Use a pair of needle nsoe pliers to remove the pump discharge guide. Hold the accelerating pump plunger all the way down, and at the same time remove the hairpin retainers and the pump link from the throttle lever and pump arm. Remove the pump assembly from the bowl. Remove the pump return spring from the pump well. Turn the bowl upside down and carefully remove the pump discharge spring and ball. While the bowl is still upside down, remove the throttle body attaching screws and gasket. Remove the idle mixture needle adjusting screw and spring from the throttle body.
Place all of the metal parts in cleaner follow manufacturer directions. Blow all parts dry with compressed air.
Check all of the parts and passages to be sure they are not clogged or contain any deposits. Blow out all of the passages and use fine nylon brushes to clear any deposits.
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Place a new throttle body gasket in position, and then attach the bowl to the body with screws and lockwashers. Tighten the screws evenly. Place the pump return spring into the pump well, and then center it by depressing the spring with one finger. Apply a few drops of oil (leather) or a dab of lithium grease (rubber) to the pump cup and install it into the pump bore. Turn the pump slowly in a circular direction as you push it into the bore to prevent the cup from rolling. Install the hairpin retainers at both the upper nad lower ends of the link. Drop the large steel ball into the pump discharge cavity of the bowl and position the spring on top of the ball.
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Insert the index end of the pump discharge guide into the spring and press the guide down until it is flush with the surface of the bowl.
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Place a new gasket in position on the air horn. Insert the power piston spring and the power piston into the air horn cavity, and then attach the main well support to the cover with a screw and lockwasher. Install the main metering jet and tighten it securly. Hold the power piston stem down, and at the same time, install the power ball, spring, and plug or T. Install a new fiber washer in the float needle and seat well, and then install the seat assembly and float needle. Attach the float and hinge pin with the float tang facing the cover.
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Set the float
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Place the assembled air horn onto the main body. Install and tighten the retaining screws. Tighten the 1/2” brass fitting on the choke suction tube. Assembly the choke piston to the shaft and slide the assembly into the choke housing bore. Retate the choke shaft counterclockwise until the piston enters its cylinder. Install the choke valve. Install the choke baffle plate if you have it, the choke housing gasket, and the thermostatic coil cover. Rotate the cover clockwise until the index marks on the cover and the housing are aligned. Tighten the three screws and retainers securely. The choke valve should touch the bore of the air horn lightly at room temperature.
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Install the idle mixture adjusting needle. Turn it gently until it seats, then back out 1.5 turns. This position will give a rough adjustment, final adjustments will be made on the vehicle. Place the choke counteweight on the end of the choke shaft, and the tang facing the choke housing. Install the spacing washer and trip lever in such a position that the tang of the trip lever will be on top of the counterweight tang when the choke is fully open. Attach one end of the choke rod to the counterweight and the other end of the rod to the fast-idle cam. The dog leg of the rod must face the idle adjusting needle. Install the pin spring and the end clip which will secure the choke rod.
