2005-2006 Honda ATV TRX500FE/FM/TM FourTrax Foreman Factory Service Manual, Page 377Get this manual
ELECTRIC STARTER Remove the following: nut washer insulator washers brush holder assembly O-ring
INSULATOR WASHER
O-RING NUT Remove the brushes from the brush holderMeasure the brush lengthSERVICE LIMIT: 9.0 mm (0.35 in)