1.9 Liter Engine
Vacuum advance is controlled from a port in primary barrel of carburetor located just above closed throttle valve. No vacuum is supplied during idling or during closed throttle deceleration. Full intake manifold vacuum is supplied at all speeds where throttle valve is opened enough to uncover port. Vacuum retard unit is supplied with intake manifold vacuum at all times by means of a line connected directly to intake manifold. During idling and deceleration, when there is no vacuum to advance unit, retard unit will cause timing to be retarded 4-9°. During part throttle operation when there is vacuum to advance unit, advance unit will overpower retard unit so that retard unit has no effect on timing.