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Yup, think you are correct… Did you have the throttle/twist grip pieces apart? If so, did the gears get “mis indexed”? Does the mag plate move freely? Try removing the clip that secures the mag plate to the vertical throttle rod to move it manually to ensure it is not jamming. There is a pin that fits through the bottom of the vertical throttle rod, that secures the vertical rod to the bottom throttle gear, perhaps the “ears” have sheared off.
Finally, make sure that the vertical throttle rod has not become twisted, this usually only occurs when something is binding in the system. In any event, the mag plate is not moving to its fully advance position and the carb is not opening up all the way.