As for the timing, it's better to under advance than over advance. Ideally though, it would be set so that at the fully advanced position (4000rpm on the 71 model?) the middle mark lines up with the mark on the crankcase. To adjust the timing, make a note of the distance by which it is off, then rotate the stator plate that same distance in the direction required to advance or retard the timing.
Suzuki state that to ensure perfect timing, users should line up the mark on the stator plate retaining hole with the corresponding mark on the side of the crankcase. This doesn't work for me though. Magneto air gaps increase, wires corrode and increase in resistance etc, etc. I just use the 'trial and error' method listed above.
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