This may be a bit of an older post, but incase sonome is researching, and comes to this, here is the answer (to my knowledge anyway)
The Victa Automatic was a bit of an odd one, you could call it the first time Victa tried to make a 'Goverened' engine.
Rather than a link to the crankshagt, or a wind vane, the automatic had a flap hannging off the front and rear of the mower, these were linked to the carburettor, instead of a throttle controller, and they would controll the speed of the emgine, based on the height of the grass.
Last edited by Bruce; 19/07/11 06:43 PM. Reason: Copyright Issue