I have a 1972 CB750 that runs but !st gear seems not to be working right. The carbs need to be done so I can;t really gun it right now. It seems as if I am in second gear trying to take off. Once rolling, everything seems to shift fine. At a stand still, it seems as if first gear goes into place. I just want to know if there is something obvious before I start a full renovation or I'm looking at something major. Thanks for your input. Oil level is fine.