Ok guys, bear with me, I'm new. Just bought a new 46 SF on you know where. Came without instructions and in a box that says it's ABC. Looks like it has a ring when looking into exhaust port. I know that they came both ways so how can I make sure. I just want to make sure since I know that break-in is different. If it is ringed, I start with 4 cycleing rich and just lean it a click or two with each tank? I know what to do if it is ABC, run it full throttle in a rich 2 cycle and maybe heat the cylinder with a heat gun before starting. Anyone familiar with these engines. Thanks Dave