2006-2012 Honda TRX90 TRX90EX/X Service Manual, Page 99Get this manual
CYLINDER HEADVALVES TOOLS Valve guide driver5.0 mm Valve spring compressor Valve seat cutter24 mm (IN45)
07942-MA60000
07757-0010000
07780-0010600
or equivalent commercially available in U.S.AValve seat cutter20.5 mm (EX, 45)
07780-0011000
Flat cutter, 24 mm (IN, 30) 07780-0012500
Flat cutter, 21.5 mm (EX, 32) 07780-0012800
or equivalent commercially available in U.S.AInterior cutter22 mm (INEX60 )