Honda CRF250RLA Owner's Manual page 76

Drive Chain Adjusting the Drive Chain Slack
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Checking the Drive Chain Wear
Check the chain wear label when adjusting
the drive chain. If the indicator groove on the
chain adjuster plate enters the red zone on
the label after the chain has been adjusted to
the proper slack, the chain is excessively worn
and must be replaced.
Chain: DID 520VF
If necessary have the drive chain replaced by
your dealer.
72
Indicator
groove
Red zone