Rear Vacuum Break

Fig. 10 Rear vacuum break adjustment:

1. Attach rubber band to green tang of intermediate choke shaft, then open throttle lever to allow choke valve to close.
2. Position magnet on top of choke valve, then rotate degree scale until zero is opposite pointer.
3. Center leveling bubble, then rotate degree scale until specified adjustment angle is opposite pointer.
4. Seat vacuum break plunger using external vacuum source of at least 18 inches Hg vacuum. On some models, it will be necessary to plug air bleed with a piece of masking tape.
5. With vacuum still applied, either rotate adjustment screw or bend vacuum break rod at S until bubble is centered, Fig. 10. On units equipped with bucking spring, plunger stem must be fully extended to compress spring on plunger. Also, the air valve rod must not restrict the vacuum plunger from retracting fully. If necessary, bend rod at arrow, Fig. 10, to permit full plunger travel.