2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 182Get this manual
CRANKCASETRANSMISSIONCRANKSHAFT Remove the countershaft and gearshift spindle oil seals
Drive the countershaft bearing out of the left crankcaseRemove the mainshaft bearing from the left crankcase using the special toolsTOOLS: Remover head, 12 mm Remover shaft Remover weight
07936-1660110 07936-1660120 077410010201 or 07936371020A or 07936-3710200 (U.S.Aonly)
Apply engine oil to the new mainshaft and new countershaft bearingsDrive new mainshaft and countershaft bearings into the left crankcase using the special toolsTOOLS: Mainshaft bearing: Driver Attachment, 28 30 mm Countershaft bearing: Driver Attachment, 37 40 mm Pilot, 17 mm