2006 Honda TRX680 Rincon Factory Service Manual, Page 89Get this manual
MAINTENANCE Coat new O-rings with oil and install them into the grooves in the valve adjusting hole capsInstall the valve adjusting hole caps and tighten the bolts securely
Coat new O-ring with oil and install it onto the timing hole capInstall the timing hole cap and tighten itTORQUE: 10 N-m (1.0 kgfm, Ibf ft) Install the removed parts in the reverse order of removal
ENGINE OIL CAUTION
Used engine oil may cause skin cancer if repeatedly left in contact with the skin for prolonged periodsAlthough this is unlikely unless you handle used oil on daily basis, it is still advisable to thoroughly wash your hands with soap and water as soon as possible after handling used oil