This article was originally published in the June 2010 edition of Minnesota Motorcycle Monthly.    http://mnmotorcycle.com/ .  The bike had featured in the magazine before, hence the familiarity of the first few paragraphs.  The whole thing was done as a reply to a 'Geezer with a Grudge' column. _____ After major surgery on its cylinder heads and a whole series of maintenance tasks and modifications, my old R75/6 lives again.   The last of its original oil seals in the bevel drive have been replaced, and I have fitted a later swinging arm with a shock absorber in the shaft drive.   A new horn replaces the feeble original, and an up rated alternator now gives me scope to plan a whole new series of alterations.   All in all it’s been a busy winter, but a month or two of commuting has shown that things have bedded in and my confidence in its reliability has been restored.   You may wonder why anyone would want to be bothered wit...