Okay, so it isn't the springs. Do a visual for the obvious stuff, like is the lever connected to the throttle or has the rod gone missing? It could be as simple as the governor lever come loose at the governor shaft or something binding in the mechanism.
Does the governor lever move when the engine is running? As RPM increases, it should move in the direction that closes the throttle fly (is your fly still attached to the shaft?).
Not to doubt 2 mechanics, but if there where broken governor parts rolling around inside the engine when it was running, you'd likely hear it.
Edited by New.Canadian.DB.Owner, March 03, 2014 - 09:34 PM.