The CB650SC (also called the Nighthawk 650) is a Honda standard motorcycle sold in the US from 1982 to 1985.
In 1982, the Nighthawk replaced the Custom of the previous years and featured a re-designed tank and side covers.
The new engine had hydraulic valve lash adjusters and was rubber mounted.
This year also saw the move from chain drive to shaft-drive for this model.
Full specs on this motorcycle can be found here