Hi. I have a ferris w/b with a "yellow pull-up" type clutch. I thought it was called an electric pto, and it started the blades with magnets or something like that. (don't laugh, i'm stupid) Now, last fall I bought an older scag w/b in need of a new engine. It's got a manual clutch. Now I'm pretty damn sure that, because of that, I don't need an engine with a charging system, so I went ahead and ordered one without. But I'm confused, because, as far as I know, my ferris doesn't have a charging system, but I was pretty sure that it does have an electric clutch! So what the hell is a charging system, and how does it that all work with different kinds of clutches?