2007-2009 Honda TRX300EX TRX300X service manual, Page 218Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT If you remove the breather plate, install new gasket
Apply locking agent to the breather plate bolt threadsInstall and tighten the bolt to the specified torque TORQUE: 12 Nm (1 .2 kgfm, Ibf.ft)
Apply locking agent to the tensioner bolt threadsInstall the chain tensioner with the collar, washer (between the crankcase and tensioner) and bolt