2015 Yamaha YZ450F — Owner's Manual
Install the lower handlebar holders with them side having the greater distance “a” from the mounting bolt center facing forward. Installing the lower handlebar holders in the reverse direction allow the front-to-rear offset amount of the handlebar position to be changed. The upper handlebar holders should be installed with the punch marks “b” facing forward. When installing the handlebar, make sure that right and left marks “c” are in place identically on both sides.
Install the handlebar so that the projection “d” of the upper handlebar holders is positioned at the mark on the handlebar as shown.