2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 89Get this manual
MAINTENANCE Coat new O-rings with oil and install them into the grooves in the valve ad justing hole capsInstall the valve adjusting hole caps and lighten the bolts securely
Coat new D-ring with oil and ins tau it onto the tim-
ing hole capIns tall the li ing ho le cap and tighten itTORQUE10 Nm 11,0 kgf -m7 Ibf-ttl
Install he removed parts in the reverse order of removal
ENGINE OIL ACAUTION
Used engine oil may cause skin cancer if repeatedly left in contact with the skin lor pro longed periodsAlthough Ihis is unlikely unless you handle used oi on daily basis, it is still advisable to thoroughly wash your hands with soap and water as soon as possible alter han dling used oil