Honda TRX450ER Owner's Manual page 116

Coolant Replacement
Refer to Saf ety Precautions
Coolant should be replaced by your Honda dealer, unless you have the
proper tools and service data, and are mechanically qualified. Refer to
the official Honda Shop Manual.
Removing the radiator cap while the engine is
hot can cause the coolant to spray out, seriously
scalding you.
Always let the engine and radiator cool down
before removing the radiator cap.
To properly dispose of drained coolant, refer to
page 178 .
Improper disposal of drained f luids is harmf ul to the environment.
on page 77 .
You & the Environment,
Servicing Your Honda
Coolant
107