2006 Honda TRX680 Rincon Factory Service Manual, Page 354Get this manual
DRIVETRAIN SYSTEM PRIMARY DRIVEN GEAR INSTALLATION (1st Shift Clutch) Blow through the oil holes in the driven gear boss with compressed airCoat new O-rings with engine oil and install them into the boss groovesInstall the primary driven gear into the shift clutch until it is fully seatedInstall the 1st shift clutch assembly (page 14-72)DRIVEN GEAR
SHIFT CLUTCH
1st SHIFT CLUTCH INSTALLATION
Install the following: M1 gear guide (apply engine oil to the gear teeth) washer new O-rings (apply engine oil)