A cold start is no problem; I adopt the same procedure I had to use on my B44 Shooting Star, except the Flash has no decompressor. Ignore the choke as it seems to do nothing. Flood the carb with the tickler, feel gently for TDC on compression, ease it over a bit, let the kickstarter up again, then give it a massive kick. Usually starts first time. Unlike when it is hot. It's OK if the engine has only been stopped for a few minutes, but any longer than that and it will just refuse to start. I just roll a ciggy, smoke it, then try again with the cold start procedure. I reckoned it was to do with the engine temperature being not quite ideal, but I've seen a few posts on here that I'm going to try next time.