Honda CRF230F 2017 Owner's Manual page 137

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4. Check the chain slider (2), chain guide slider (3),
chain roller (4) and lower slider (5) for wear.
If the chain slider and lower slider are worn to
the bottom of the cutouts (6), have your Honda
dealer replace the slider. Replace the chain guide
slider if the chain is visible through the wear
inspection window (7).
Replace the chain roller if it is smaller than:
18 mm (0.7 in)
(4)
(6)
(6)
(5)
(7)
(2) Chain slider
(2)
(3) Chain guide
slider
(4) Chain roller
(5) Lower slider
(6) Cutouts
(7) Wear inspection
window
(3)
5. Measure a section of the drive chain to determine
whether the chain is worn beyond its service
limit. Measure the distance between a span of
pins from pin center to pin center. If the distance
exceeds the service limit, the chain is worn out
and should be replaced.
New chain: 635 mm (25.0 in)
Service limit: 637 mm (25.1 in)
This motorcycle has a staked master link drive chain
which requires a special tool for cutting and staking.
Do not use an ordinary master link with this chain.
See your Honda dealer.
CRF230F
Span of pins
measured: 41