How do you set the timing on a 1980 Yamaha yz 125?

Answer 1

To set the timing of a 80' yz125, look at the rotor magnet. On the edge of the magnet there should be marks, these are what you use to time the electrical sequence(time the spark). All you have to do is set the piston at top dead center and then align the mark on the magnet with the similar mark on the stator. To do this, you have to loosen the nut that retains the magnet, then tighten it when the marks are aligned properly.