Att: Rod Bolt After re-building for broken piston and rings. I checked the TDC as per manual with dial guage,it was correct. When I went to the full advance check this became a little fuzzy. The book said after finding TDC with the dial gauge to set it to zero. then it says to turn flywheel clockwise untill dial gauge indicates the proper spec which is .13. My question is if you turn clock wise you move into ATDC on the flywheel markings. Yamha does not use a timing light check why is this. Thanks mike