2004-2009 Honda TRX450R/TRX450ER Service Manual, Page 490Get this manual
ELECTRIC STARTER (TRX450ER) ASSEMBLY FRONT COVER DUST SEAL O-RING WASHER INSULATOR ARMATURE SHIMS
SEAL RING BRUSH HOLDER
Install the brushes into the brush holderBe careful not to Install the insulator and new O-ring onto the cable damage the O-ringterminal, and the brush holder into the rear coverAlign the holder tab with the case groove