sleeper06, did they say the engines were from ECA?
I put a allen wrench in the cylinder, one hand holding it perfectly in line with the piston, and my other hand cranking the kicker. I turned it over a few times to get a positive feel for BDC and TDC. Once I felt exactly where TDC was, I took a flat piece of thin metal, set it flush against my head and slid the metal piece up against the bottom of the allen wrench at TDC and marked it exactly were the two pieces met. I did the same for BDC, marking the top of the allen wrench. measured the difference, 54mm exact.