Welcome to the forum.

I think you are having a problem with the way the throttle and/or carb are set up.
The throttle should move freely with the cable hooked up, but not in the carb. Once you get that, then hook it up to the carb. Make sure the C shaped metal thing is on top of the clip, but under the spring.

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If it ain't broke, and you mess with it long enough, it will be.