Honda CBR1000ST 2019 Owner's Manual page 167

Remove the reserve tank cap and add
3.
fluid while monitoring the coolant level.
Do not overfill above the UPPER level
u
mark.
Make sure no foreign objects enter the
u
reserve tank opening.
Securely reinstall the reserve tank cap.
4.
Install the parts in the reverse order of
5.
removal.
Tighten the middle cowl bolts.
u
Torque: 1.0 N·m (0.1 kgf·m, 0.7 lbf·ft)
Reserve tank cap
Coolant
WARNING
3
Removing the radiator cap while the
engine is hot can cause the coolant to
spray out, potentially scalding you.
Always let the engine and radiator cool
down before removing the radiator cap.
Changing Coolant
Have your dealer change the coolant unless
you have the proper tools and are
mechanically qualified.
Changing Coolant
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163