2006-2009 Honda TRX250EX/TRX250X Service Manual, Page 137Get this manual
CYLINDER HEADIVALVECAMSHAFT Reface the seat
whenever valve gUide IS lapaced
Use 45' seat cutter to remove any rou ghness or irregula rities from the seat
TOOLS: Seat cutter, 33 mm (45 INI Seat cutter, 29 mm (45 EX) Cutter holder, 5.5 mrn
ROUG HNESS
077800010800 077800010300
01781 0010101
or equivalent commen:ially avai la ble in U.S.A
Using fla cu tter, remove 14 of the existing valve seat material
TOOLSFlat cutter, 33 mm (32 INI Flat cutter, 30 mm (32" EX) Cutter holder, 5.5 mm
07780-0012900 07780-0012200 07781-0010101