And while you've got the head off, have a look at the AI hole. Just had a wild idea - could you get another spark plug in there? I seem to remeber reading that it is the same thread as the plug hole. If this is the case, and the tip of the plug emerges from the head at about the same distance as the proper plug, then there could be a possibility of using a twin-plug setup for each cylinder that might provide a useful power gain. Of course, you would need new coils but there are plenty of those out there (dynafire etc. etc.). There again, this might not work at all but worth a try, I suppose
