Reassemble the pump injector if necessary. Renew the small o-ring.
Push the pump injector into the main body.
Push the accelerator pump assembly into the main body so that the plastic bearing is flush with the mating surface. If the spring pushes the plastic bearing out then renew the bearing.
Fit new needle valves to the upper body. Check that the new needle valves are free to move up and down without any resistance. Refit the plastic floats using new pins.
Check for side to side play in the floats. Renew the float if the play is excessive.
Measure the float heights.
Screw in the two main jets.
Place the new float chamber gasket on top of the main body and carefully lower the upper body onto it. Screw in the four upper body screws/fasteners. Don’t forget to fit the ID tag to one of the screws.
On 2B5 carburettors without EGR, blank off the vacuum port to the left of the idle mixture screw using a rubber nipple cap.
Renew the o-rings for the idle speed and mixture screws and screw them in until they just seat. Then back them out a few turns. The correct size of o-ring is critical.
Screw in the three jet / air correctors at the top of the carburettor.
Check/set the distance between the full load enrichment nozzle and the choke flap to 0.5mm +/-0.75mm.
Fit the choke link rod.
Check/set the dechoke. To do this, begin by wrapping an elastic band around the choke lever and upper body to close the choke flap, as illustrated below. Now fully rotate the primary throttle lever to open the throttle. One should see that the choke flap is forced open slighly at wide-open-throttle. Measure the choke-flap opening with a drill shank. It should be 5.7 +/-0.5mm. A 6mm drill would suffice if a 5.7mm drill is not available. To adjust the clearance, loosen the primary throttle spindle nut and slide the de-choke cam up to increase the de-choke, or down to reduce it. Afterwards, tighten up the nut and re-check the clearance, then remove the rubber band.
Fit the choke diaphragm with its inlet hose and reducing jet but do not connect the other end of the hose to the base of the carburettor yet.
Open the throttle roughly half way to allow the fast idle screw to be placed on the seventh step of the cam, and release the throttle lever once that is done.
Measure the clearance (A) between the choke diaphragm plastic rod and the choke lever. It should be 0.75 +/-0.25mm. If necessary, adjust by bending the small end of the choke lever.
Check the setting of the choke diaphragm.
Connect the choke diaphragm inlet hose to the base of the carburettor.
Screw in the fuel cut-off valve.
Push the accelerator pump link rod back into its bushing on the throttle lever.
Refit the secondary throttle diaphragm.
Screw in the centre bolt at the top of the carburettor.
Attach the hot start valve.