Honda CB650F 2018 Owner's Manual page 74

Brakes Adjusting the Brake Light Switch
u
Adjusting the Brake Light
Switch
Check the operation of the brake light switch.
Hold the brake light switch and turn the
adjusting nut in the direction A if the switch
operates too late, or turn the nut in the
direction B if the switch operates too soon.
Brake light switch
Adjusting nut
B A
70