ORIGINAL: CGRetired

It comes with a basic OS8 plug which is just fine for that engine. I've been using that plug on my OS AX engines, both upright and inverted, as well as S&W 15% nitro 20% oil blend fuel for years now. The fuel is no big deal, any quality fuel is just fine.. you may find some blends are better in your location and altitude, I don't know what that is, but I swear by S&W 15%. I'm sure there will be some debate about that, though, there always is.