Hello when you work on that mower remember where the fuel tank sits as it can effect the way the fuel gets to the engine,I once put the tank on one of my Victas under the handles it would not run put it back on top runs beautifully,dont drop the carburettor needle especially if it's the black one they are little beggars to find,the needle can be orange,green black or white ,the spring in the diaphragm on the back is also coloured mine are all on purple that sets the revs at 3670 yellow is slightly faster for the four blade disc ,plain metallic is slightly slower but gives a richer mixture as does the position of the valve in the carburettor, position A is usually the normal running speed jezza