Honda TRX450R Service Manual page 509

LIGHTS/SWITCHES (After 05)
Replace the ECT sensor if it is out of specifications
by more than 10% at any temperature listed.
Apply sealant to the ECT sensor threads. Do not
apply to the sensor head.
Install the ECT sensor and tighten it.
TORQUE: 9.8 N m (1.0 kgfm, 7 Ibf-ft)
Connect the ECT sensor connector.
Fill and bleed the cooling system (page 9-7).
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