Well it seems like I haven't even seen a G4, the only thing I can think off is there must have been some differences during the change over period.
The early LM or late G4, with the emulsion tube, seems to be running well, with the short testing (running in) period given to it. Have some other commitments to attend to and haven't got back to it yet. Getting anxious as it is so close to being finished now and pretty positive it is only electrics in the way. BTW magnets seem strong as picked up a 12" screw driver no worries [thanks Grumpy (archives)].

Any positive answer on whether the air gap on the coil is adjustable on these?

It seemed to me that there were only two threaded holes and no slots to slide the coil in or out(?)
Will try another coil too.

Still very keen to get the right muffler.