1999-2002 TRX400EX Fourtrax Service Manual, Page 100Get this manual

CYLINDER HEADVALVE Using 60" interior cutter, remove 14 of the existing valve seat materialTOOLS: Interior cutter, 30 mm Cutter holder, 5.5 mm

07780-0014000 07781 -0010101

or equivalent commercially available in U.S.A
Using 45" seat cutter, cut the seat to the proper widthVALVE SEATWIDTH: 1.0-1.1 mm (0.039-0.043inl Make sure that all pitting and irregularities are removed1.0-1.1mm (0.039- 0.043 in)

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