2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 182Get this manual
COOLING SYSTEM INSTALLATION M ake sure he rubber seal the hermostat is in good con ditionInstall th herm ostat into the hou si ngali gn ing he
ho le with the lug
Install th thermostat an tighten the two bolts
securely