Being a member of the XS1100 Facebook page, it's amazing the stuff I'm seeing on there that I have not seen on this site. Bryan Horn (Aussie1100G [107 hp XS]), posted a comment on his C5 Optical Ignition system. Pretty pricey, but seems to be a very nice mod.
http://www.c5ignitions.com/motorcycle-ignitions.html
http://www.c5ignitions.com/motorcycle-ignitions.html
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