Honda CRF125F 2021 Owner's Manual page 87

4. Check the chain slider (2) for wear.
If the depth (3) of the chain slider
reaches the service limit, have your
dealer replace the chain slider.
Service Limit:
3 mm (0.1 in)
(3)
(3)
(2) Chain slider
(3) Depth
(3)
(2)
5. Measure a section of the drive chain to
determine whether the chain is worn
beyond its service limit. Remove the
drive chain and measure the distance
between a span of pins from pin centre to
pin centre. If the distance exceeds the
service limit, the chain is worn out and
should be replaced.
New Chain:
508 mm (20.0 in)
Service Limit:
518 mm (20.4 in)
Measure a span of : 41 pins.
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