2000-2003 Honda TRX350 Rancher factory service manual, Page 113Get this manual
CYLINDER HEADVALVE T he valve cannot be groundIf the valve ace 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: 1.2 mm (0.05 in) SERVICE LIMIT: 1.5 mm (0.06 in) If the valve seat width is not within specification, reface the valve seatSEAT WIDTH