2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 186Get this manual
CRANKCASEITRANSMISSIONCRANKSHAFT Install the mainshah, countershah and shift drum as an assembly nto the left crankcaseRotate the sh ih drum to check the transm ission operationInstall the crankshaft (page 11 -6)
CRANKCASE ASSEMBLY
Clean the crankcase mating surface before assemblyNOTE:
Dress the surfaces with an oil stone to correct any minor roughness or irregularities After cleaning lubricate the transm ission bearings and other contacting surfaces with engine oilInstall the dowel pins and new gasket onto the left crankcase