There is a factory manual for the DOHC 750 right
http://honda-cb750-s.456789.n3.nabble.com/NEW-Repair-manuals-4-5-2010-UPDATE-td685918.html#a685918 here. It should give you good details on just about everything on your bike.
Please download it, and let the forum know if you need more help. Good luck.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.