Are you just checking the marks or did you change the belts??? Your 749 falls into a different category than most desmoquatros, It is in the 998, 999 family. And, It is a minor nightmare to pull the belts off without setting up the marks before the belts come off. Your cams will be at 12 o-clock, the marks straight up, the belts are clearly marked, or should be, the number of teeth in between the cams can be counted, if all 3 marks line up, you know it is aligned right. That is the crankcase and the 2 cams. I have pages of info on this if you want to read it. You will have to let me know. Hope this helps. 2002 S4,,, 99 750 monster