Quote:

The secondaries are spring loaded, downdraft opens them on full throttle and forced closed by a lever when throttle is released.



Huh? The secondaries are opened mechanically by a link rod from the primaries, the only spring involved is the one in the primaries to prevent the secondaries from opening when the choke is closed.

The use of the weighted air flapper in the secondaries is yes/no; some had it, some didn't.

The INTERNET, the MISinformation superhighway