If I started the unit manually holding up the throttle linkage, the motor ran as expected. Much thought and inspection led me to discover that the governor arm did not, unless manually turned anti clockwise, push up on the throttle linkage much, leaving it well short of the adjustment screw. Of course it only ran for a small number of seconds before I shut it down. Upon restart the engine revved hard regardless of the throttle setting (I had connected it). The carbie is a Nikki with one float bowl. I couldn't find reference to this spring readily. This I am not sure of as there are no holes to which it could realistically connect (it's a fine spring), leading me to convince myself that the only possibility was to hook around the choke bracket that allows the cable movement (across the mower) to actuate the choke linkage (rod). There was one other spring that appeared to connect to the choke mechanism at one end and to the other a bracket secured by the bottom left hand side manifold bolt. I refitted all the linkages and springs (3) after much thought followed by some googling (which showed I had the 2 springs related to the governor arm- the governor spring and governed Idle spring, correctly fitted). I had a carbie problem which was solved with a small O-ring replacement in the float bowl. Should the governor shaft only have 15-20 degrees of movement when the arm is freed/removed? Does movement in excess of this mean the governor set up inside the motor has came apart/adrift/failed? I was hoping someone could confirm for me what I believe to be a failure in the internal governor mechanism on a Briggs and Stratton Intek twin, 20 hp.
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