2007-2009 Honda TRX300EX TRX300X service manual, Page 266Get this manual
REAR WHEELSUSPENSION Replace the seal rubbers if they are worn, deteriorated or damageClean the bearing holder outer surface and the swingarm inner surfaceCoat new O-rings with engine oil and install them into the bearing holder groovesBe careful not to damage the O-rings
Apply grease to the bearing holder seating surfaceInstall the bearing holder into the swingarm until it is fully seated
Coat new O-ring with engine oil and install it onto the bearing holderInstall the stopper bolt with washer and tighten the bolt to the specified torqueTORQUE: 10 N'm (1.0 kgfm, Ibfft)