I've turned the diaphragm about 45 degrees and the starwheel 3/4 of a turn (both clockwise). No great change i have to say, but perhaps a little better.
I dont know the history of this engine, so not sure if it has been done before though. The metal 'washer' that is bolted on top of the diaphragm has a small punch mark on it and that was sat at about 2.30 position if 12 o clock is at the front of the pump nearest the timing case. After adjusting, this is now sat at about 5 o clock.
There was a definate wear line on the cone that i guess was where the needle runs up and down - at the 12 o clock position. Am i right in thinking that the position of the cone is relative to that 12 o clock position as that is where the pin comes out and touches the cone? I may try another 45 degrees and see. Smoke is fine - only a little on full acceleration.
When is the time to adust the full power screw?