2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 343Get this manual
REAR DRIVING MECHANISM Install the shim and bearing onto the pinion gearNOTE: When the gear set, ring gear bearing, andor gear case has been replaced, use 2.00 mm (0.79 in) thick shim for initial referencePINION GEAR BEARING
SHIM Drive the bearing with the marked side facing upTOOLS: Driver, 40 mm I.DAttachment, 30 mm I.D07746-0030100 07746-0030300 DRIVER