The original post regarding this tech tip was made by me about two years ago.
I obtained the "carb tweak" from "Dale" the owner of Specialty Spares after purchasing my exhaust & jet kit from him.

Site Link:
http://www.specialtyspares.com/pages/1/index.htm

*It’s also on a site dedicated to our carbs (see link below)

Just one thing...some how, the second part to this MOD is missing, so here it is...

After drilling the vacuum port to 7/64 don’t simply de-bur the hole, chamfer it with an even larger drill bit.
YOU WILL notice after MOD when you crack the throttle on your TBA/Speedmaster (after warmed up) it will NOT choke out. TBA/Speedmaster(s) without MOD will gasp and/or choke out.
Also, throttle response will be as good as you can get!
I have been told by many other “old school racers” since, that this is an old common racing MOD.

CV Site link:
http://images.google.com/imgres?imgurl=h...hl%3Den%26lr%3D

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G@ry J@mes