Four years after its controversial taxpayer-funded bailout, General Motors' (GM -1.45%) turnaround looks like it's finally hitting its stride. But there's still a good chance that GM won't be able to emulate Ford's (F -2.35%) success. In this video, Motley Fool analyst John Rosevear explains some of the risks that could affect GM stock -- and explains clearly what to keep an eye on in coming quarters.