Honda CRF250F Owner's Manual Installation And Operation page 196

5. Tighten the rear axle nut to:
108 N·m (11.0 kgf·m, 80 lbf·ft)
If a torque wrench is not used for this
installation, see your dealer as soon as
possible to verify proper assembly.
6. Recheck drive chain slack.
Lubrication and Cleaning:
Lubricate every 500 km (300 miles) or
sooner if chain appears dry.
The O-rings in this chain can be damaged
by steam cleaning, high pressure washers,
and certain solvents. Clean the side
surfaces of the chain with a dry cloth. Do
not brush the rubber O-rings. Brushing will
damage them. Wipe dry and lubricate only
with drive chain lubricant designed
specifically for O-ring chains. Commercial
chain lubricants may contain solvents which
could damage the rubber O-rings.
Recommended lubricant:
Drive chain lubricant designed specifically
for O-ring chains.
If not available, use SAE 80 or 90 gear oil.
71