Ok so im thinking theres some wires crossed here.

SeanW's wifes mower is not a ULT motor, its a TVS.
Vccomm, not sure you are talking about a ULT/VLV motor, Im just servicing one, came in to google the oil volume (and got this tread again) as Ive put 600ml in and its on empty, volume is 810ml. TVS motor takes 630ml.

Ihatewetsocks, are they all ULT's? Im a fan of new carbs on the TVS's as well, but the chinese quality is dubious. You have to watch the fuel inlet elbows, ive filed the carb mount holes across on a few so the inlet elbow would clear the block.