Join Date: Mar 2008
Location: Nova Scotia Canada
Its under your left side engine case, behind your charging rotor (flywheel) You have to get a rotor puller and remove the flywheel. Once off you will see it bolted to the back of the rotor with three bolts.
Just a click sounds like your start solenoid though, depending on where the click is coming from, did you starter spin freely after you rebuilt it?
You need a multimeter. Make sure that with the start button depressed that you have voltage at BOTH of the large studs at the start solenoid. If not, than your solenoid is giving you troubles.
1981 cb750c with 900f forks, cams, oil cooler.