The negative cable, which is normally connected to the negative pole of the battery, is fastened to the crankcase. From here, the cable branches off and splits up within the electrical system to carry the ground connection to the different elements in the system.

The image shows the ground connection on left side of the engine crankcase.
The battery charging circuit and power distribution
Electrical power for lighting and signalling devicesSteering angle adjustment
Loosen the nuts (17) and adjuster screws (16) on both sides of the bottom
yoke.
Use a 6 to 6.5 Mm spacer (a) fitted to the fork outer tube, or use a gauge.
Turn the front forks to the right until the spacer (a) is seated against the
frame top tube.
Tighten the adjuster screw (16) to ...
Refitting the tail light
Fit the spacers with collar (3) into the rear vibration dampers (2) located
on the gloves compartment (23).
Note
Two spacers (3) must be inserted inside and outside on the right side and
two spacers (3) must be inserted inside and
outside on the left side.
Insert the split vibration damp ...
Refitting the rear sprocket
Check the cush drive bushes (6) condition and, if necessary, replace them by
removing them from the flange.
Refitting is the reverse of removal.
Apply recommended grease on the rear sprocket flange (5) external diameter.
Place the rear sprocket flange (5) on sprocket (17) by inserting it ...