2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 169Get this manual
CLUTCHGEARSHIFT LINKAGE Apply engine oil to he lifter arm spindleInsta ll the return spring and lifter arm into the crank case cover by align ing the spring ends with the groove in the cover and the hole in the spin dle
INSTALLATION
Clean off any gasket material from the crankcase mating surface tho rough lybeing carefu not damage itInsta ll the following:thrust washeroil pump rivennew -ring (apply engine oil)