Honda CB300R 2019 Owner's Manual page 68

Maintenance Fundamentals
Also inspect the drive sprocket and driven
sprocket. If either has worn or damaged teeth,
have the sprocket replaced by your dealer.
Normal
(GOOD)
NOTICE
Use of a new chain with worn sprockets will cause
rapid chain wear.
66
Worn Damaged
(REPLACE) (REPLACE)
# Cleaning and Lubricating
After inspecting the slack, clean the chain and
sprockets while rotating the rear wheel. Use a
dry cloth with chain cleaner designed
specifically for O-ring chains, or neutral
detergent. Use a soft brush if the chain is dirty.
After cleaning, wipe dry and lubricate with the
recommended lubricant.
Recommended lubricant:
Pro Honda HP Chain Lube or equivalent