2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 171Get this manual
CYLINDER HEADVALVECAMSHAFT Remove the spark plugLoosen the band screw and remove the carburetor insulator if necessaryRemove the engine coolant temperature (ECT) sensor if necessaryBAND SCREW
INSULATOR
Do not strike the cylinder head too hard
ECT SENSOR
Remove the four bolts and the cylinder head
CYLINDER HEAD Remove the gasket and dowel pins