Triumph Repair: TR6 Weber conversion, vacuum leak, accelerator pedal

Question
Scott, I put dual Weber 32/36 DGV 5As on my 72 TR6.  After a few hours of
adjusting the idle screws and the the idle mixture screws, the car now pulls
strong with no backfires through the carbs.  I now have only two
problems/questions.  The engine hesitates when I push of the accelerator
pedal.  I know this sounds like an accelerator pump problem, but the pumps
seem to be working when I look down the throats of the carbs and advance
the throttle.  The second question is where to set the timing now that I have
disconnected the vacuum retard.
Thanks, Steve

Answer
On the timing, you can just set it for the most advance you can get under accelleration without the engine pinging.  There are enough ports on the webers that you can connect the vacuum retard if you want.  There is usually one on the bottom side  and top side of where the carb mates to the manifold; you just have to look and determine which one is the manifold side of the butterfly (yes) or not (no)

For the accel pump, there are different size jets you can get for the nozzle, and singe vs. dual nozzles.  Whether the engine stumbles because the mix is too lean and the pump delayed (adjust the actuator) or the mix is too rich (pump squirt too much too early), I can't tell you.  

A color tune plug might help determine the cause, there also may be a vacuum leak interfering with the mixture as the butterfly opens the progressive holes in the venturi...