Sorted!!
It looks like it was just a case of finding how it had been set up and running before I had it.
Set the float heights correctly at 13mm, and had to run with the airbox lid removed (strangely it did not run correctly with no air box at all)

175 mains with the PJets blocked off on premix, plug chop looks good.

I want to run with the airbox lid back on (too loud), anyone any idea of where the main jet size should be leaving the PJet blocked off & premix??
What is the usual increase for running no Pjet?