We don't have diagrams for the connections for the zone control cable. I read you response to Joseph P about the cable might be broken.
The zone control cable should move a lever on the flywheel brake on the engine. Move the bail against the handle and see if the cable is pulling the flywheel brake lever toward the rear of the engine. This movement disengages the flywheel brake so the engine can turn over.
To inspect the flywheel brake closer, remove the upper cover (blower housing) from the engine. You might find something is broken or loose in the flywheel brake assembly.
The governor arm should move freely and when you move the throttle plate and governor arm and release them they should snap back to their original position. If this is not happening, spray the linkage with carburetor cleaner or WD40 and work them back and forth 3-4 times. If the linkage is still tight, the linkage is binding somewhere. Adjust the linkage to clear the binding.