Purists use a throttle cable from the pedal shaft to a lever on a dummy shaft mounted across the weber inlet manifold.  The dummy shaft is then connected by parallel levers on this shaft and each carb's butterfly shaft by an adustable link, usually using uniball joints. It looks and works very well.
 
Alternatively you can drive the dummy shaft by the conventional linkages rather than use the cable.  If the carbs dont open fully, increase the length the lever on the dummy shaft.  
----- Original Message -----
Sent: Friday, 14 July 2000 21:18 PM
Subject: Throttle linkages

I was just wondering what the best way is to hook up a set off twin webbers to the throttle on the floor of the car.  At present the old man has adapted the standard link on the firewall ( the bit under the washer motor that links to the original carby set-up) to the webber throttle rail that opens up the throttle on the webbers.  While this is a neat and tidy set-up it seems that this doesn't supply enough leverage thus the carby butterflies don't open up completly (Probably about 85-90% which is probably a good thing for a lead-footed 18 year old)
 
Adjust this to open the butterflies fully  means a higher idle.  Basically more leaverage is required, either from the pedal set-up or replacing the whole shebang with a throttle cable set-up instead of leavers and connecting bars.  What is the best and easiest solution?  (sorry about the length)
 
Daniel Kroehn

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