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Posted this earlier for the young chap who inherited a 650ss. Had mine for over 40 years and was a pig to get tick over  for 20. Had a lucas refurb on the mag, no change. Eventually by luck more than knowledge I fitted copper leads and unsuppressed caps. A completely different bike for the better, then she blew the head gasket. Not used to running properly i reckon. No issues since then, my right monoblock always ran a bit lean but I fitted concentrics over 30 years ago.