Hi Grumpy, have disconnected all wires from motor as suggested, no change. Have double checked valves, carby etc, all are set correctly and clean. I have only started the tecumseh once with the wires connected, that wouldnt be enough to start burning out the ignition module would it.
Did find a workshop manual yesterday and started looking through the wiring side, man talk about confusing, hopfully wont be needed now. Going to keep checking things, will let you know if i sort it out.