2006-2009 Honda TRX680 (TRX 680 FA-FGA) Factory Service Manual, Page 346Get this manual
DRIVETRAIN SYSTEM 2nd3rd SHIFT CLUTCH AND MAINSHAFT DISASSEMBLY Remove the countershalt l2ndf3rd shift clutch} and
mainshaft (page 13-7)Remove the end washers with screwdriver and disassemble the countershaft:
thrust washer C2 gear bearing lock washer C3 gear
bea ring thrust washer 2nd 3rd shift clutch assembly