What is the easiest and most accurate way of finding BTDC without the plunger tool or specialty tools? I just received a new sparx ignition kit and I am having trouble finding the proper setting for BTDC through the crankcase timing plug. There is two notches to look for? How do you know which notch is TDC and BTDC? Any and all help is very much appreciated. Btw.... I have the Haynes manual, and all it shows is how to find TDC.