A little off of your question, but a recent thread about a factory notice mentioned that the pickup gap should be .8mm rather than the manual's .8 to 1.2mm range. They said that after making this change in production, they have had no more claims or investigations about coils not working.
Also,if a timing light were alternated between both spark plugs and showed a difference (since there is only one pickup coil under the alternator cover) a coil or plug or the CDI could be malfunctioning (at that time!!) but the pickup coil would be okay.
