KeithAB

Can anyone help please. I've been given a WK GO 50 jjt3 and have watched many Youtube videos on the various aspects of maintenance and servicing. It's a simple question, but from what I've seen on YouTube, maybe not. I want to connect the battery. I've seen guys doing it the standard way - negative first, positive last. THEN, I've seen mechanics in bike shops connecting the positive first. Begs the question: Are Chinese mopeds earthed positive or negative? For such a simple machine it seems there's a world of mixed up information online. Appreciate any advice, thanks