It sounds too lean. It runs fine with cold enrichment(choke), but when the choke comes off, it stumbles. Try this: with the engine running and warmed up, take off the center carb's air filter and drizzle a little carb cleaner into the carb, or slowly hold your hand over the throat of the carb. If the idle speeds up, it's too lean. You may be able fine tune it by turning the air fuel mixture screws counterclockwise a bit at a time until it smoothes out. You may indeed have an air leak. The outer carbs on these set-ups are pretty bomb proof, in my experience. Check the center carb and mixture settings, and for vacuum leaks (hoses, etc.) first. JMHO.......
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