Choke Vacuum Kick

Fig. 13 Adjusting choke vacuum kick using angle gauge:

ANGLE GAUGE METHOD

1. Attach rubber band to green tang of intermediate choke shaft, Fig. 13.
2. Open throttle to allow choke valve to close.
3. Set up angle gauge and set to specifications.
4. Using tool C-4207A or equivalent, apply at least 18 inches Hg vacuum to nipple on choke diaphragm. The air valve rod must not restrict plunger from retracting fully. If necessary, bend rod to permit full plunger travel. Final rod clearance must be set after vacuum kick setting has been made.
5. With vacuum applied, adjust screw to center bubble.

Fig. 14 Adjusting choke vacuum kick using plug gauge:

PLUG GAUGE METHOD

1. Attach rubber band to green tang of intermediate choke shaft, Fig. 14.
2. Open throttle to allow choke valve to close.
3. Using tool C-4207A or equivalent, apply at least 18 inches Hg vacuum to nipple on choke diaphragm. The air valve rod must not restrict plunger from retracting fully. If necessary, bend rod to permit full plunger travel. Final rod clearance must be set after vacuum kick setting has been made.
4. With vacuum still applied, apply slight opening pressure on choke blade and insert specified plug gauge between top of choke blade and air horn casting.
5. Adjust as necessary by adjusting screw until a slight drag is felt when gauge is withdrawn.