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If I recall correctly, the butterfly valve should be attached to a rod that activates it. Sounds like the spring or actuater is shot or missing. If that is the case, you may have a few solutions, like trying to replace it with a new spring, or rebuilt carb al together.
I have seen people who have gone so far as to rig a manual choke with something as "cheap" and "simple" as parts gotten from a bike shop.
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