Husqvarna CR 125 2011 Workshop Manual page 50

SETTINGS AND ADJUSTMENTS
CR 125 2011 - WR 125 2011
The chain lubricant shall NEVER get in contact with the tyres or the
rear brake disc.
Chain guide roller, chain guide roller, chain guide, chain slider
Check the wear of the above-mentioned elements and replace them
when necessary.
Check the chain guide alignment, and remember that a bent element
can cause chain early wear. In this case, chain might unwrap from
the sprocket.
Workshop Manual Ed. 06-2011
D.20