Ok, I thought the idle needle was the LSN.. oops.

I've played around with the LSN, HSN and idle needles a lot - nothing really makes the engine run better. I've sealed the backplate and all around the carby (Ipulled it off after a LOTof effort - should have just left it in place, in hindsight). Ican now get the car moving around without stalling, at least a little bit. Still not clear if it's running lean or rich. I've put an LRPR4 plug in, doesn't really seem to have changed anything dramatically. Very frustrated.

The OS28XZ is starting to look more and more attractive.