Honda CRF1100A 2021 Owner's Manual page 296

Brakes Adjusting the Brakelight Switch
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Adjusting the Brakelight Switch
Check the operation of the brakelight switch.
Hold the brakelight 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.
290
Brakelight switch
Adjusting
nut
B A