On the flywheel is a one-way clutch. It matches to a large starter gear that turns the motor over if the smooth surface on the large starter gear has become chattered/no longer smooth the you will need to replace it and the three rollers in the starter clutch to make the starter grab and turn over the motor. On the diagram you are looking at part numbers 28 and 15. http://www.bikebandit.com/houseofmotorcycles/1981-honda-cb650/o/m1975#sch31728
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