I really had to look, used a magnifying glass to find it and on crankshaft I found a small barely legible (what looked like a 1/3 circle) and aligned it to the mark on the cam (partially drilled hole) and when I put it together it started on the very first pull. I will say it even surprised me. I was so trilled that I let it run for a while ran it at various speeds to hear it run. then my wife came out (not to share my enjoyment) but to remind me that it was 11 o'clock (PM .... that is :wave. Let's just say she was not as thrilled as I was.