Ok I know this might appear OT but I am sure I have seen somewhere that some
Self Launchers (wankel I think) used F1 sparkplugs that are no longer
available. I f this is true and you havent rebored yours for new style spark
plugs then this may be your opportunity as Minardi is flogging off all sorts
of things inc two types of Sparkplugs (no idea if they are the right ones)
see http://www.bachellp.com/plantandmach..._cat_day_4.asp

rgds
stephen