First go by sight. When you move the throttle does anything happen on the engine end? Anything? Movement, stiff, a wiggle?

If nothing at all, then go back to the engine and disconnect it from the carb like before. See if you can move it in and out, basically pull and push on it to see if it's loose on the throttle end.

You'll need to remove throttle assembly. I can't remember who just did this and gave pictures. That would be the easiest way to explain it.