I think one of the reason many TR3 owners have trouble with rich running S/U's is in the linkage connections. The proper set-up, although standard, is missed by what appears tobe obvious, but it is not. Specifically, with the lower linkage between the "Jet-Levers", on the rear carb the lever goes between the fork on the end of the linkage. Where the mistake is made is on the front carb, where the lever is attached to the "backside" of the fork and not through it, then the long connecting pin goes through the lever, then the fork. Then, on the outside of the pin you insert your choke cable and washer then tighten the nut to hold the choke cable in place. 
If your throttle linkage is not attached this way, the lever does not push the choke back home and rich running carbs are the result.

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