Just for further background on the principles involved, keep in mind that, unlike a car distributor/points setup, the timing on a SOHC changes with point gap. In fact, there are usually three ways to change timing: entire backing plate, backing plate for each set of points, and point gap. The trick is to juggle all three so that the point gaps are approximately at spec and timing is at spec also. If you're at the limts with the backing plates, then put the backing plates mid-range, and time with point gap. If the points are in good shape, the gap after you time should be close to spec. If not, then you can fiddle with the backing plates to help out the gap problem.
- Mark
