There are other forums around that deal with WW2 motorcycles such as BSA WM20's and others. I use to visit one forum site on BSA WM20's but the topics and self-appointed experts ruined it for me. You don't put jap carbys or clutches on a BSA just to make it go better, you ruin it. If you want a pussy bike buy a jap one
I owned a 42 BSA WM20 for over 20 years and it was a great bike, not flash or fast, but it always made me smile when riding it around. To me, that's what it was all about.