1999-2002 TRX400EX Fourtrax Service Manual, Page 128Get this manual
CLUTCHGEARSHIFT LINKAGE MAINSHAFT
Measurethe mainshaft 0.0atthe clutch outer guideSERVICE LIMIT 21.91 mm (0.863 in)
ASSEMBLY
Coat the clutch outer guide with molybdenum oil solution and install it onto the mainshaft with the flange side facing the crankcase