which mark on the HB lined up to your tab, the new ,the old or none, when you had the valves closed? its kinda understood if yourer in time, have fuel and fire, its suppose to run. if youve got all of that, then maybe the plugs have stopped firing, you can kill a new set of plugs in raw gas in a min. if they are wet put a new set in. let me know where the timing mark was. what hes telling you about the mark dont make no sense to me. if you have the same HB and your timimg tab is at the same place on you motor then you cant move the mark. you can move it but its no good to you. but if you took the valve cover off and found TDC then you didnt need the mark. so i dont know.