2005-2008 Honda ATV TRX500FA/FGA Fourtrax, Rubicon Factory Service Manual, Page 179Get this manual
CYLINDER HEADVALVECAMSHAFT Turn the camshaft holder to check the bearingThe bearing should turn smoothly and quietlyReplace the camshaft assembly if the bearing does not turn smoothly and quietlyCheck the decompressor cam operationPress on the decompressor cam as shownAs you press on one side, the decompressor cam should lock above the base of the exhaust cam lobeAs you press on other side, the decompressor cam lobe extend below the base of the exhaust cam lobePush DECOMPRESSOR CAM Push
CAMSHAFT INSTALLATION
Install camshaft holder onto the camshaft assemblyInstall the dowel pins if they were removedDOWEL PINS
CAMSHAFT HOLDER Remove the timing hole cap (page 3-10)Rotate the crankshaft using the recoil starter knob and align the "T" mark on the flywheel with the index mark on the rear crankcase coverINDEX MARK