Starting

Fig. 8 Variable Speed Governer:

With the engine stationary the centrifugal weights and sliding sleeve are in their initial position, Fig. 8. The starting lever is moved to the starting position by its spring and pivots around the point M2; at the same time the control collar on the distributor plunger is held in its starting position by the ball pin of the starting lever. This set of conditions means that the plunger has a large stroke (maximum delivery = starting delivery) before delivery ends.
Thus the starting-fuel delivery is determined. Once starting begins, it takes only a modest rotational speed - the cranking speed - to affect the centrifugal weights and move the sliding sleeve against its weak spring the distance a. The starting lever pivots around M2, reducing delivery automatically to the idle level.