2005-2011 Honda FourTrax Foreman TRX500 FE/FPE/FM/FPM/TM Service Manual, Page 389Get this manual
REAR DRIVING MECHANISM Install the shim and bearing onto the pinion gear
NOTEWhen the gear set, ring gear bearing, andor gear case has been replaced, use 2.00 mm (0.79 in) thick shim for initial reference
Drive the bearing wi the marked side facing upTOOLSDriver, 40 mm 1.0
Attachm ent, 30 mm 1.0