OK Norm,

So the G4 is the one with the idle screw adjuster, the G3 is the similar one without the idle screw. Whats the LM then? Or is this marked somewhere on them and I have missed it?

Sorry but I have never really understood these carbys other than to disconnect the kill switch which I do by cutting the wires but leaving the probes in their original place. If I take those probes out on some of them everything seems to lock up.

Thanks
Jeff