2007-2009 Honda TRX300EX TRX300X service manual, Page 321Get this manual
IGNITION SYSTEM Check the O-ring for wear, deterioration or damageCoat the O-ring with engine oil and install it onto the timing hole capApply grease to the timing hole cap threadsInstall the timing hole cap and tighten it to the specified torqueTORQUE: 10 Nm (1.0 kgfm, Ibf.ft)