Went in this weekend to check valves and change to yz timing... Manual states that at tdc, the punch marks on the cam should line up with the cylinder head (before yz timing mod). The intake cam on my bike is positioned one tooth clockwise. There were still 13 pins (timing chain) between punch marks. Now, after the timing change, both of my cams are rotated one tooth clockwise. There are now 12 pins between the punch marks. Bike runs strong. I remember reading a similar post on this same subject a while back. The responses seemed to say disregard the position of the punch marks as long as the cam lobes face away from each other and there are the proper # of pins between the punch marks. I got spooked this weekend when the manual said to make sure the punch marks do line up with the cylinder head or else serious engine damage could occur. Anyone have any input on this? Any advice is much appreciated. On a side note: How much resistance should there be when sliding the feeler guage under the cam lobes to check valves? I can fit a wide range of feeler guages in so surely the amount of resistance is important. Thanks again for any help.