the cam pully has a little triangle bit in one of the holes which will line up to a mark on the head lookin through the whole, the crank will have mark on the lower aux pulley that will line up with a mark on the crank pulley cover or u can do this with the lower aux pulley off usin the crank pulley, it has a big washer behind it with a point stickin out line it up with a line on the crankcase these 2 atr tdc, get these right an tension it up, but check an double check its all still timed when tensioned