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#302036
CHUCK
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    At the base of the vertical throttle connector….there is a “weak link” pin that engages with the gear assembly at the base.  If that is damaged or sheared it will prevent the throttle from operating properly.  #49 on the diagram.

    If you haven’t already I would disconnect tne mag plate from the throttle at the “quick disconnect at the top of the throttle lever.  It should be possible to see if the obstruction lies with the mag plate itself….or the twist grip and its parts.