According to some my '80 R100RS is badly abused. In order to keep up with my wife's modern Honda VFR I had to breath on it a little. It has a big bore kit (1050), sport cam, ported large valve heads, triple valve springs, titanium collars, light wrist pins, light flywheel, modified airbox, modified exhaust, dual plugged, ignition booster, fork brace, billet top tree, and a braced swingarm. It will pull 8500RPM in high gear. It is also still very streetworthy and has been coast to coast in that guise. I have put over 50,000 mi since the conversion and it still runs great. Purists claim it won't be any good to ride, it will break, etc. All my bikes have always been modified and this one is no exception.
Robbie


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