How to adjust Suzuki 1 10 motorcycle engine valve?

The timing of a motorcycle can only be centered, and it cannot be adjusted artificially, even if one tooth is wrong.

1 10 When the motorcycle is centered, first rotate the magneto counterclockwise, align the T-point dash line of the magneto rotor with the inspection hole mark of the engine housing, so that the piston is at the top dead center, the O-point of the timing sprocket is directly in front of the cylinder head, the two cams of the camshaft are tilted backwards, and the timing sprocket is installed on the camshaft, so that the rocker arm of the magneto valve will not move slightly.