When you mention a link, I assume that you’re talking about the fast idle link and this model:
http://rides.webshots.com/photo/2829647430098611668HBDljd It's a W-1 model 684 from 1949; the earlier models did not have this fast idle link. It has an accelerator pump that is spring-loaded from the top, which forces the throttle open. The earlier W-1’s had an accelerator pump that was spring loaded from the bottom, which kept the throttle closed.
Jon aka carbking is the man to talk to about this and if you stay with it he may chime in with the real skinny on this application.
Denny Graham
Sandwich, IL
