1999-2002 TRX400EX Fourtrax Service Manual, Page 98Get this manual

1999-2002 TRX400EX Fourtrax Service Manual, Page 98

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CYLINDER HEADVALVE
UNEVEN SEAT WIDTH

Contact area (too high ortoo low)Reface the valve seat
NOTE: The valve cannot be groundIf the valve face is burned or badly worn or if it