Deceleration System: Description
The system is used to reduce emission levels during deceleration. The deceleration valve is activated by intake manifold vacuum and positions the throttle flap and advances the timing to prevent an overly rich mixture. The system is composed of a deceleration valve (Solex), a deceleration vacuum unit, a vacuum advance unit, and 3 connecting hoses.
The deceleration valve contains 3 ports, a check ball, a pushrod, an adjustable vacuum diaphragm, a barometric compensating diaphragm, and 2 atmospheric ports. The deceleration vacuum unit is an adjustable diaphragm with linkage to the carburetor throttle flap.