I got to looking at my L1s finally, and yes the cams are different. One is a 4 lobe, the other 2. In fact, I was able to phase mine a little better to the crankpin by loosening the setscrews and advancing it a bit (it was triggering on the 45s). You might be able to see the lobe in line with the back of the crankpin. I am utterly obsessed with this since I filmed the 765 up close last fall at the Cuyahoga Valley Scenic RR doing its 'chuff show' - those guys are really cool for doing that! In any case, it might be worth seeing if your cams are actually aligned with the microswitch. There's a bit of lateral movement in my drivers and if it went over far enough I could see how the switch might not align with the cam. Also verified the chuff input is going to the CC board and not the sound board. The sound board requires a floated input, where the CC switches chuff to ground. Hope this helps!
