2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 509Get this manual
LIGHTSSWITCHES (After 05) Replace the ECT sensor if it is out of specifications by more than 10 at any temperature listedApply sealant to the ECT sensor threadsDo not apply to the sensor headInstall the ECT sensor and tighten itTORQUE: 9.8 (1.0 kgfm, Ibf-ft) Connect the ECT sensor connectorFill and bleed the cooling system (page 9-7)