I suspect this thread will be deleted, but anyway.
I'm not the biggest "Jan fan" since I lost about 40k on my eggenfellner subaru, but my bad, I was an idiot, I don't blame anyone but myself.
That said, I think that if you use an electrically dependent engine you need to understand a bit about electricity. It seems that was the problem in the second video.
The first one seemed to be a guy that didn't understand the AF ratio he should have. 19:1 is pretty lean, and I am not surprised that the engine didn't like it very much.
If you are ready to invest the time, energy, and money in an alternative engine, it can work great as we've seen with a lot of conversions. If you don't have all three, and perhaps the introspection required to evaluate yourself, my advice would be to do it exactly as the kit supplier recommends. Just my $0.02.