I used a piston stop to find TDC. Rotate clockwise until you find #1’s compression stroke. Pull the rocker arms on #1 and continue until you hit the stop and make a mark, then ccw until you hit it again and make another mark. Half way between them is TDC. I used a measuring tape to find the circumference of the crank pull and divided that by 360 to come up with 1.6mm per degree, then made a few timing marks. This is all so I can properly calibrate my motors timing when I start tuning.