1999-2002 TRX400EX Fourtrax Service Manual, Page 129Get this manual
CLUTCHGEARSHIFT LINKAGE Install the lock washer with the "OUTSIDE" mark facing out
Apply oil to the threads and seating surface of new clutch center lock nut and install it onto the mainshaftHold the clutch center with the special tool and tighten the lock nutTOOL Clutch center holder
077240050002 or
equivalent commercially available in U.S,A
TORQUE: 108 Nm (11.0 kgfm80Ibf.ft)
Be careful notto damage the mainshaft threads