2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 133Get this manual

2005-2009 Honda TRX400EX/TRX400X Service Manual, Page 133

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CYLINDER HEADVALVE Using 45 seat cutter, cut the seat to the proper width VALVE SEAT WIDTH1.01.1 mm (0.0390.G43 in )
After cutting the seat, apply lapping compound to the valve face, and lap the