Hello,
Just realised that I posted this in the wrong place! Sorry!
The mower is simply running too fast and hence the run away when you engage the clutch! You can just about get a reasonable speed before the cut off switch in the carb operates. hence the slightest bump and the mower either stops or shoots off! Unlike most other mowers, there doesn't seem to be a adjustable mixture jet or adjustable slow running jet. So unless you change the timing I am stumped. The carb is clean and assembled in the correct manner. The diaphragm is in good shape. I do like this Victa. They are built like a tank, I just love the big end bearing! This particular Victa has a cast alloy deck and it should last forever. If only I can slow it down a little,
Any help would be much appreciated,

Andrew.