2004-2007 Honda Aquatrax ARX1200N3/T3/T3D Factory Service Manual, Page 315Get this manual
CYLINDER HEADVALVE
VALVE SEAT INSPECTIONREFACING
Clean all intake and exhaust valves thoroughly to remove carbon depositsApply light coat of Prussian Blue to the valve seatTap the valve against the valve seat several times without rotating the valve, to check for proper valve seat contact
The valve cannot be groundIf the valve face is burned or badly worn or if it contacts the seat unevenly, replace the valve
Remove the valve and inspect the valve seat faceThe valve seat contact should be within the specified width and even all around the circumferenceSTANDARD: 0.90 1.10 mm (0.035 0.043 in) SERVICE LIMIT: 1.5 mm (0.06 in) If the seat width is not within specification, reface the valve seat (page 10-19)SEAT WIDTH