Last year, the second-generation, single-cylinder BMW G650GS—previously called the F650GS before that name was reassigned to the entry-level GS Twin in the U.S.—made a glorious comeback, replacing the not-quite-so successful third-generation G650X models. Following on the coattails of last year’s successful GS is the more off-road-oriented G650GS Sertao, which is essentially an “Adventure” version of [...]