You're mixing units. The voltage signal from the sensor isn't itself relevant because it's translated by the LM-1 into the AFR number it displays. In principle a sensor that provided an output that went from 0 to 357 Volts, or -27.2 to +45.3 Volts, could be mapped into numbers that ranged from, say, 9 to 20.if the sensor maxes out at 5V, then why does the AFR go over 20?
I made a bit of progress on my jetting this morning. I found that turning the pilot mixture screw all the way in had no effect on the rpm. The last time I had that problem, coincidentally on a different Gold Star but with a Monobloc, I found the float level was very low. So, although I checked it long ago, it's time to check the float level again. Well, not quite time. We're having a birthday brunch for my older daughter in 45 min. so it will have to wait until later.
With the pilot screw all the way in I made another 8-mile run. Halfway through the run, when the engine was fully up to temperature, I stopped and watched the AFR as I adjusted the pilot screw. It got richer as I backed it out a half turn, and got leaner as I turned it back in, so all the way in was leaner than yesterday (but still not correct). Anyway, with the somewhat leaner pilot mixture the bike behaved better than yesterday. The mixture was still too rich but it never dropped below 10 where igniting it seems to be problematic.
The DocZ rollers are earning their keep. Bikes like rich mixtures to start and my Amal 1036 doesn't have a choke. But, that's no problem with rollers. One problem I am having, though, is I'm way too used to the up-for-down shift pattern of my other Gold Stars. This one has rear sets, but not a reverse cam plate, so it has a Triumph-like up-for-up shift pattern.