2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 266Get this manual
ELECTRIC STARTER four screws front cover FRONT COVER A
SCREWS gasket reduction gear assembly GASKET
REDUCTION GEAR ASSEMBLY Check the reduction gear shaft and reduction gear for wear or damageTurn the outer race of the bearing on the reduction gear shaft with your fingerThe bearings should turn smoothly and quietlyAlso check that the beari ng in ner race tits tightly on the reduction gear shaftREDUCTION GEAR