Newbie here. Did search but can't find the answer here. I am adjusting the valves. Look through the timing hole to crank and there is 3 marks " I I I " - which one is TDC?. If I line it up on the 3rd mark then the cams are in the correct place (alignment dots at 180 degrees flat with top of case -just like in the manual). If I line it up with the center mark cams are not in correct location - slightly off. 2008 YZ450F - any guidance here ? Not sure why there are three marks, manual only shows one ? Thanks for your help.