Primary Vacuum Break Adjustment

Fig. 18 Primary vacuum break adjustment. 1982 E2SE Carburetor:

NOTE: Before performing adjustment procedure, remove primary vacuum break from carburetor and position bracket in vise, then grind off adjusting screw cap and reinstall vacuum break.

1. Rotate degree scale until zero is opposite pointer, then with choke valve completely closed and fast idle screw on high step of fast idle cam, place magnet squarely on top of choke valve and rotate bubble until it is centered, FIG 18.
2. Rotate scale so that specified degree for adjustment is opposite pointer.
3. Seat choke vacuum diaphragm using a vacuum source with over 5 inches HG of vacuum. Check to insure that air valve rod is not restricting the vacuum diaphragm from being seated. It may be necessary to bend air valve rod to obtain a slight clearance between rod and end of slot in air valve lever. If the air valve rod adjustment is disturbed, refer to the Air Valve Rod Adjustment procedure after completing the primary vacuum break adjustment.
4. Hold choke valve toward the closed position by lightly pushing on intermediate lever and note angle gauge reading.
5. If adjustment is necessary, use a 1/8 inch hex wrench to rotate adjusting screw in rear cover until bubble is centered.
6. After completing adjustment, apply a suitable sealer over adjusting screw head.