The micro switch was part of the early cis cars with the hand throttle lever by the hand brake. On the 1973.5 the cold start valve will activate any time the key is in the start position with the hand throttle raised. In 1974 start system was refined, and the thermal time switch was added. If the hand throttle is not raised, the cold start valve will not operate.
This is the part of the start system for the 1973.5 cis.
