1999-2004 Honda TRX400EX FourTrax Service Manual, Page 99Get this manual
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CYLINDER HEADVALVE REFACING NOTE:
TOOLS Valve seat cutter, 35 mm (IN1 Valve seat cutter, 29 mm (EX) Cutter holder, 5.5 mm
07780 0010400 077800010300 07781-0010101