I would test the ignition coil and igniter per the Helms Manual. I think your on the right track and your right, these components are located in the distributor. All Honda's usually suffer an issue with the distributor related to one or more of the internal components(electronic ones). This to me is a design issue because the high temps reached while located in the distributor with insufficient cooling can lead to premature ignition coil and igniter failure. The only other thing I would think of is that you may have an issue with the timing belt(may have jumped a few teeth).