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Honda CRF450RL 2021 Owner's Manual & Off-Road Handbook page 81

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BRAKE DISC INSPECTION
Visually inspect the brake discs for damage or cracks.
Measure the thickness of the brake disc and replace it if
necessary.
SERVICE LIMIT: Front: 2.5 mm (0.10 in)
Rear:
3.5 mm (0.14 in)
Measure the warpage of the brake disc and replace it if
necessary.
SERVICE LIMIT:
Front: 0.3 mm (0.01 in)
Rear:
Refer to an official Honda Service Manual or see your
dealer to replace the brake disc.
BRAKE LIGHT SWITCH
Adjust the rear brake light switch so that the brake light
comes on just prior to the brake actually being engaged.
If the light fails to come on, adjust the switch so that the
light comes on at the proper time.
Hold the switch body and turn the adjuster [1]. Do not
turn the switch body.
• The front brake light switch does not require
adjustment.
[1]
0.3 mm (0.01 in)
HEADLIGHT AIM
Place the motorcycle on a level surface.
Adjust the headlight aim vertically by turning the vertical
beam adjuster [1].
• Adjust the headlight aim as specified by local laws and
regulations.
[1]
CLUTCH SYSTEM
CLUTCH LEVER FREEPLAY
Measure the clutch lever freeplay at the lever end.
FREEPLAY: 10 – 20 mm (0.4 – 0.8 in)
10 – 20 mm
(0.4 – 0.8 in)
Maintenance
2-55

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