Honda CRF250RL 2017 Owner's Manual page 80

Drive Chain Checking the Drive Chain Slider
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Checking the Drive Chain Slider
Check the condition of the drive chain slider.
The drive chain slider will need to be
replaced if the chain slider is worn to the
wear limit indicator or wear limit line.
To inspect the wear limit line, remove the
drive sprocket cover by removing the bolts.
If necessary have the drive chain slider
replaced by your dealer.
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Drive chain slider
Wear limit
indicator
Wear limit
line
Drive sprocket cover
Bolts