It´s easy. First make sure the piston is down in the bore a little, (so you don´t bend the valves), then position the cam so the two lobes are both down and the valves are going to be closed. Then you line up the "T" mark on the flywheel with the pointer and then with the front stretch of chain tight the scribed line on the cam shaft sprocket should be parallel with the join in the head/cover. The cam should just need to be moved a little to line up the two bolt holes and that´s it, Easy!